For function [tex]f(x) = \left \{ {\frac{x+1}{x^{2} -1} ,\ {x\neq 1} \atop {1,\ x=1}} \right.[/tex] given in the problem, the limit [tex]\lim_{x \to 1} f(x)[/tex] doesn't exists.
In mathematics, what are functions?A relation between a set of inputs and a set of allowable outputs is called a function, and it has the characteristic that every input is associated to precisely one output. When every element in set A has one end and only one image in set B, then the mapping from set A to set B is a function. Let A & B be any two non-empty sets.
Now for given function,
Limit exists, if LHL=RHL=f(a)
I. [tex]f(x) = \frac{1-x^{2} }{x-1}=\frac{(1-x)(1+x)}{x-1} = \frac{-(x-1)(x+1)}{(x-1)} = -(x+1)[/tex]
applying limit,
[tex]\lim_{x \to 1} f(x)= -2[/tex], LHL= RHL= f(1) = -2. Hence, limit exists
II. [tex]f(x) = \frac{x^{2} -x^{3} }{x^{2} -1}=\frac{-x^{2} (x -1)}{(x-1)(x+1)} = \frac{-(x^{2} )}{(x+1)}[/tex]
applying limit,
[tex]\lim_{x \to 1} f(x)= \frac{-1}{2}[/tex] , also LHL= RHL= f(1) = -1/2. Hence, limit exists
III. [tex]f(x) = \left \{ {\frac{x+1}{x^{2} -1} ,\ {x\neq 1} \atop {1,\ x=1}} \right.[/tex]
[tex]for x\neq 1,\\f(x)=\frac{(x+1)}{x^{2} -1} = \frac{x+1}{(x-1)(x+1)} = \frac{1}{x-1}[/tex]
RHL= [tex]\lim_{x \to 1+h} f(x) = \lim_{h \to 0} f(1+h) =\lim_{h \to 0} \frac{1}{1+h-1}[/tex]
[tex]\lim_{h \to 0} \frac{1}{h} =[/tex] Undefined.
LHL = [tex]\lim_{x \to 1-h} f(x) = \lim_{h \to 0} f(1-h) =\lim_{h \to 0} \frac{1}{1-h-1}[/tex]
[tex]\lim_{h \to 0} \frac{1}{h} =[/tex] Undefined
and [tex]f(1)=1[/tex]
Hence,[tex]\lim_{x \to 1} f(x)[/tex] doesn't exists
IV. [tex]f(x) = \left \{ {\frac{x^{2} -3x+2}{x -1} ,\ {x\neq 1} \atop {-1,\ x=1}} \right.[/tex]
[tex]for x\neq 1,\\f(x)=\frac{(x^{2} -3x+2)}{x -1} = \frac{(x-1)(x-2)}{(x-1)} = {x-2}[/tex]
RHL= [tex]\lim_{x \to 1+h} f(x) = \lim_{h \to 0} f(1+h) =\lim_{h \to 0} (1+h-2)= -1[/tex]
LHL= [tex]\lim_{x \to 1-h} f(x) = \lim_{h \to 0} f(1-h) =\lim_{h \to 0} (1-h-2)= -1[/tex]
and f(1) = -1
Hence,[tex]\lim_{x \to 1} f(x)[/tex] exists
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100 points! Please help If you don't know it don't answer it.
There are approximately 7.48 liquid gallons in a cubic foot. If a cylindrical water tank holds 1,200 liquid gallons and has a radius of 2.4 feet, what is the approximate height of the water tank? Approximate using π = 3.14 and round to the nearest tenth.
(A) 2.2 feet
(B)8.9 feet
(C)27.9 feet
(D) 124.1 feet
Answer: B
Step-by-step explanation:
The volume of the cylindrical water tank can be calculated as:
Volume = π x radius^2 x height
We know that the tank holds 1,200 liquid gallons, which is equivalent to:
1,200 / 7.48 = 160.43 cubic feet
We also know that the radius of the tank is 2.4 feet. Substituting these values into the formula, we get:
160.43 = 3.14 x 2.4^2 x height
Solving for height, we get:
height = 160.43 / (3.14 x 2.4^2) = 8.9 feet (approx.)
Therefore, the approximate height of the water tank is 8.9 feet (b).
Answer:
its B, 8.9, trust me, I got it right on the test
Step-by-step explanation:
Enrollment in French class at a high school is 0.72 of enrollment in Spanish class. What is enrollment in French class compared to Spanish class as a fraction and as a percent?
Question content area bottom
Part 1
What is the equivalent fraction?
What is the equivalent percent?
Using fractions, we can determine that the enrolment percentage in relation to the Spanish class is 72%.
What are fractions?A fraction is a component of a whole.
Mathematically, the number is expressed as a quotient, where the numerator and denominator are divided.
In a simple fraction, both are integers.
In a complex fraction, a fraction can be found in either the numerator or the denominator.
A suitable fraction has a numerator that is less than its denominator.
So, let's say that x students are enrolled in the Spanish class.
The enrolment in the French class is 0.72 times as large as the attendance in the Spanish class, or 0.72, according to the figures provided.
The enrollment as a percentage of Spanish classes is:
0.72x / x = 0.72
The enrolment percentage in relation to the Spanish class is:
0.72 x 100% = 72%
Therefore, sing fractions, we can determine that the enrolment percentage in relation to the Spanish class is 72%.
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Correct question:
Enrollment in French class at a high school is 0.72 of enrollment in Spanish class. What is enrollment in French class compared to Spanish class as a fraction and as a percent?
help me plaeseeeeeeeeeeeeeeeeeeeeeee
Answer:
B
Step-by-step explanation:
Every 2 balloons you buy the price goes up by 6.4 so for every 1 balloon, the price goes up by 3.2 since 6.4/2=3.2
NEED help on 20-25 please and thank you
The sum of the measures of the interior angles of a nonagon is 1260 degrees
The measure of each interior angle of a regular octagon is 135 degrees
How to calculate the anglesA nonagon is a polygon with nine sides, and the formula to calculate the sum of the measures of the interior angles of a polygon with n sides is:
Sum of interior angles = (n-2) x 180 degrees
Therefore, the sum of the measures of the interior angles of a nonagon is:
Sum of interior angles = (9-2) x 180 degrees = 1260 degrees
An octagon is a polygon with eight sides, and the formula to calculate the measure of each interior angle of a regular polygon with n sides is:
Measure of each interior angle = (n-2) x 180 degrees / n
Therefore, the measure of each interior angle of a regular octagon is:
Measure of each interior angle = (8-2) x 180 degrees / 8 = 135 degrees
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Find area of the shaded region.
The area of the shaded region of the composite figure is 389 square units.
What is area of composite figure?A geometric shape made up of two or more simpler shapes is known as a composite figure. You must divide a composite figure into simpler shapes and then add up each shape's unique regions to determine the composite figure's area.
The methods you can take to determine a composite figure's area are as follows: Slice up the composite figure into more basic forms. You can separate the composite figure into its component parts, for instance, if it is made up of a rectangle and a triangle.
Calculate the area of each shape separately.
The total area of the composite figure can be calculated by adding the areas of all the simpler shapes.
The shaded region can be divided into a rectangle and a triangle.
The area of the rectangle with l = 19 and w = 17 is:
Area = length x width = 17 x 19 = 323 square units
Now, the dimensions of the triangle are:
base = 17 - 6 = 11
height = 31 - 19 = 12
Thus,
Area = (base x height) / 2 = (11 x 12) / 2 = 66 square units
Now, the total area of the shaded portion is:
Area = 323 + 66 = 389 square units.
Hence, the area of the shaded region of the composite figure is 389 square units.
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I need help. Please Help.
Sequence from least interest amount to greatest amount is
investment of $400 at 3% for 6 years
investment of $400 at 14% for 2 years
investment of $300 at 14% for 6 years
Define simple interestSimple interest is a type of interest that is calculated only on the principal amount of a loan or investment, without taking into account any accumulated interest from previous periods. It is a linear function of time and is calculated by multiplying the principal amount, the interest rate, and the time period. The formula for simple interest is:
I = P × r × t
To calculate the simple interest earned on an investment of $400 at 3% for 6 years, we can use the formula:
I = P × r × t
Plugging in the given values, we get:
I = 400 × 0.03× 6
I = 72
Therefore, the simple interest earned on an investment of $400 at 3% for 6 years is $72.
To calculate the simple interest earned on an investment of $300 at 14% for 6 years, we can use the formula:
I = P ×r× t
Plugging in the given values, we get:
I = 300×0.14× 6
I = 252
Therefore, the simple interest earned on an investment of $300 at 14% for 6 years is $252.
To calculate the simple interest earned on an investment of $400 at 14% for 2 years, we can use the formula:
I = P ×r ×t
Plugging in the given values, we get:
I = 400 ×0.14 × 2
I = 112
Therefore, the simple interest earned on an investment of $400 at 14% for 2 years is $112.
Hence, sequence from least interest amount to greatest amount is
investment of $400 at 3% for 6 years
investment of $400 at 14% for 2 years
investment of $300 at 14% for 6 years
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it is known that the average IQ of the population of adults is 100. A sample of 50 college students has an average IQ of 108. The probability of this difference being caused by random chance is 1/1000. Are these results statistically significant?
Options:
no, because the results are likely to occur by chance
no, because the results are unlikely to occur by chance
yes, because the results are likely to occur by chance
yes, because the results are unlikely to occur by chance.
Answer:
yes, because the results are unlikely to occur by chance
Step-by-step explanation:
1/1000 is converted to 10% as a decimal. That's like saying for everyone 1000 people, at least one of the can be this "random chance". The smaller the general population is, the higher the affect this percentage has on that group. If the population is lower, than there might be more of a chance that it'll occur but also because there's a smaller population, there's less variety.
Ms. Thomspon needs 15/2 yards of red fabric and 7 1/2 yards of silver fabric. which comparison is true.
Step-by-step explanation:
To compare the two amounts of fabric, we need to express them with a common denominator:
15/2 = 30/4
7 1/2 = 15/2
Now we can compare the two amounts:
30/4 > 15/2
This is true because 30/4 is equal to 7.5 yards, which is greater than 7.5 yards (or 15/2 yards) of silver fabric.
Therefore, Ms. Thompson needs more red fabric than silver fabric.
The function f(x)= -3|x-4.7|+2 represents to the temperatures of the solo in degrees Fahrenheit, x minute into an experiment on what interval is temperature positive?
To find on what interval the temperature is positive, we need to find the values of x for which f(x) is greater than zero.
The function f(x) is defined as:
f(x) = -3|x - 4.7| + 2
Since the absolute value of any real number is always non-negative, we can see that f(x) will be positive only if the expression inside the absolute value bars is less than 2/3. So, we can set:
-3|x - 4.7| + 2 > 0
Solving for |x - 4.7|, we get:
|x - 4.7| < 2/3
This means that x must be within 2/3 units of 4.7. So, the interval on which the temperature is positive is:
4.7 - 2/3 < x < 4.7 + 2/3
Simplifying, we get:
4.0333 < x < 5.3667
Therefore, the temperature is positive on the interval (4.0333, 5.3667).
Rewrite in simplest terms: 5(-C - c - 1) - 4c
Answer:
- 14c - 5
Step-by-step explanation:
5(- c- c - 1) - 4c ← distribute parenthesis by 5
= - 5c - 5c - 5 - 4c ← collect like terms
= - 14c - 5
Sofia has 3 candy bars. She gives of each candy bar to her friends. Which expression represents the
amount of candy that is left?
A. 4 x 3/4
B. 3 x 4/3
C. 4 x 4/3
D. 3 x 3/4
12-2=11-1 true or false
Answer: True
Step-by-step explanation:
12-2=10
11-1=10
Answer:
True
Step-by-step explanation:
12-2 equals to 10
11-1 also equals to 10
Therefore, 12-2=11-1 is true
Terrence had some problems to complete for math homework. He completed six problem as shown in the diagram which represented 40% of the problem he had to do in all.How many problems does he have altogether for homework?
After answering the presented questiοn, we can cοnclude that equatiοn Therefοre, Terrence had 150 prοblems altοgether fοr his math hοmewοrk.
What is equatiοn?A mathematical equatiοn is a fοrmula that cοnnects twο statements and denοtes equivalence with the equals symbοl (=). An equatiοn is a mathematical statement that shοws the equality οf twο mathematical expressiοns in algebra. In the equatiοn 3x + 5 = 14, fοr example, the equal sign separates the variables 3x + 5 and 14.
A mathematical fοrmula describes the cοnnectiοn between the twο sentences that οccur οn οppοsite sides οf a letter. The symbοl and the single variable are frequently the same. As in 2x - 4 Equals 2, fοr instance.
6 is tο 40% as X is tο 100%
Therefοre, Terrence had 150 prοblems altοgether fοr his math hοmewοrk.
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3.75 +9.25-(-4.75*0.5-0.2*2-3)
Answer:
-7.225 according to a calculator.
URGENT PLEASE HELP - Find the length of the triangle below
Answer:
√(25+12√2) ≈ 6.48
Step-by-step explanation:
You want the length of the longest side, labeled x, in the obtuse triangle with sides of lengths 3 and 4 and angle 135° between.
Law of CosinesThe law of cosines tells you ...
c² = a² +b² -2ab·cos(C)
Using this here, we have a=4, b=3, C=135°:
x² = 4² +3² -2·4·3·cos(135°)
x² = 25 -24(-√2/2) = 25 +12√2
x = √(25 +12√2) ≈ 6.48
Complete the following proof. Show all of your work.
Prove: The segment joining the midpoints of two sides of a triangle is parallel to the third side.
1. Assign (x, y) coordinates to points A, B, and C.
2. Calculate the (x, y) values for points M and N.
3. Calculate the slope of MN.
4. Calculate the slope of AB.
5. Show that the slopes are equal. What can you conclude? B
Since m_MN = m_AB, we can conclude that the segment joining the midpoints of two sides of a triangle is parallel to the third side.
What is triangle?Triangle is a three-sided polygon with three angles. It is one of the basic shapes in geometry and is usually considered the simplest type of polygon. Triangles are distinguished by their sides, angles, and whether or not they are equilateral, isosceles, or scalene. The sides of a triangle are always connected, and the angles of a triangle always add up to 180°.
Let A(x1, y1), B(x2, y2), and C(x3, y3) be the vertices of a triangle. Then the point M, which is the midpoint of the side AB, coordinates M(x1 + x2 / 2, y1 + y2 / 2). Similarly, the point N, which is the midpoint of the side AC, has coordinates N(x1 + x3 / 2, y1 + y3 / 2).
The slope of the segment MN is given by:
m_MN = (y1 + y3 / 2 - (y1 + y2 / 2)) / (x1 + x3 / 2 - (x1 + x2 / 2))
The slope of the segment AB is given by:
m_AB = (y2 - y1) / (x2 - x1)
Substituting the coordinates for M and N into the equation for m_MN, we get:
m_MN = (y1 + y3 / 2 - (y1 + y2 / 2)) / (x1 + x3 / 2 - (x1 + x2 / 2))
= (y3 - y2) / (x3 - x2)
Substituting the coordinates for A and B into the equation for m_AB, we get:
m_AB = (y2 - y1) / (x2 - x1)
= (y3 - y2) / (x3 - x2)
Since m_MN = m_AB, we can conclude that the segment joining the midpoints of two sides of a triangle is parallel to the third side.
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If I was getting food stamps and I needed three months proof of income and I had to have a gross of 2495 and net of 1920 what would I need to put for the three months income amount?
Answer:
26
Step-by-step explanation:
10 + 15
Answer:
Step-by-step explanation:
yes you would. they are very strict with food stamps or EBT card they will still ask for the 3 months for so put in your 3 months and you should be fine.
The circle below is centered at the origin, and the length of its radius is 3. Write the equation for the circle.
Answer: $x^2+y^2=9$
Step-by-step explanation:
A circle is the locus of points such that its distance from its center is constant. In our case, we have that the center of the circle is the origin, while the radius is 3. Thus, by the Pythagorean Theorem, the equation of the circle is $x^2+y^2=3^2=9$.
Blanche has recently inherited $8100
, which she wants to deposit into a savings account. She has determined that her two best bets are an account that compounds daily at an annual rate of 4.7%
(Account 1) and an account that compounds annually at an annual rate of 3%
(Account 2).
Step 2 of 2 : How much would Blanche's balance be from Account 1 over 4.8
years? Round to two decimal places.
Therefore, Blanche's balance from Account 1 over 4.8 years would be approximately $10,081.25.
How to find annual amount?To find the annual amount, you first need to know the frequency of the payment. If the payment is made monthly, you need to multiply the monthly payment by 12 to get the annual amount. If the payment is made weekly, you need to multiply the weekly payment by 52 (the number of weeks in a year) to get the annual amount.
If the payment is irregular or occurs at different intervals, you can add up the total amount received over the course of the year and use that as the annual amount.
by the question.
To calculate the balance of Account 1 after 4.8 years, we can use the formula for compound interest:
[tex]A = P(1 + r/n)^{(nt)}[/tex]
where:
A = the final amount
P = the principal (initial deposit)
r = the annual interest rate (as a decimal)
n = the number of times the interest is compounded per year
t = the time period (in years)
Plugging in the values given in the problem, we have:
[tex]A = 8100(1 + 0.047/365)^{(365*4.8)}[/tex]
[tex]A=8100(1+0.00128)\\A=8100(1.00128)\\A=8,110.43[/tex]
[tex]A \approx8,110.43[/tex]
Therefore, Blanche's balance from Account 1 over 4.8 years would be approximately $10,081.25.
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WILL MARK BRAINLIEST ANSWER ASAP
which choice is equivalent to the product below when x is >or equal to 0
Answer:
here is ur answer....OPTION "D"
Step-by-step explanation:
Triangle EFG has vertices E(−4, 1), F(−3, −2), and G(2, 1). Find the coordinates of the image of points E', F', and G' after a translation 2 units down.
The coordinates of the images after the translation are E'(-4,-1), F'(-3,-4), and G'(2,-1).
Finding the coordinates of the image of points E', F', and G'To translate a point 2 units down, we subtract 2 from its y-coordinate.
For point E(-4,1), the image E' will have coordinates (-4,1-2) = (-4,-1).
For point F(-3,-2), the image F' will have coordinates (-3,-2-2) = (-3,-4).
For point G(2,1), the image G' will have coordinates (2,1-2) = (2,-1).
Therefore, the coordinates of the images after the translation are E'(-4,-1), F'(-3,-4), and G'(2,-1).
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The ratio of apples to oranges in a fruit salad is3:2. How many kilograms of apples and oranges are there in a salad of 3 kgs?
Let x be the number of kilograms of apples in the fruit salad.
Then, the number of kilograms of oranges is (2/3)x, because the ratio of apples to oranges is 3:2.
The total weight of fruit salad is 3 kgs, so we can write an equation:
x + (2/3)x = 3
Simplifying and solving for x, we get:
(5/3)x = 3
x = (3*3)/5
x = 1.8
Therefore, there are 1.8 kg of apples and (2/3)*1.8 =
1.2 kg of oranges in the fruit salad.When randy started his job, he earned $5.40 an hour. Now he makes$234 for a 40-hour week. How much more does randy earn per hour than he did when he started?
Answer:
Randy makes 45 cents more than he did when he started.
Step-by-step explanation:
If Randy makes $234 for a 40 hour week, that means he makes $5.85 an hour. You can find how much he makes currently by dividing the total amount he earned by the amount of hours worked.
[tex]234/40=5.85[/tex]
He initially earned $5.40 an hour and he now earns $5.85. By subtracting his final earnings by his initial earnings it gives you the amount his earning increased by.
[tex]final= $5.85initial= 5.40[/tex]
[tex]5.85-5.40=0.45[/tex]
He makes 45 cents more than he did when he started.
a can contains 15/16 pound of vegetables.One serving of these vegetables weigh 1 fourth pound.
A. 15/64
B. 4/15
C. 1 3/16
D. 3 3/4
The number of servings that can be obtained from the can is 3 3/4.
What is equation?An equation is a formula that links two statements and uses the equals sign (=) to indicate that the statements are equivalent. A mathematical statement proving the equality of two algebraic expressions is called an equation. For instance, the equal sign divides the variables 3x + 5 and 14 in the equation 3x + 5 = 14. The relationship between the two sentences that appear on opposing sides of a letter is expressed mathematically. The single variable and the symbol are typically the same. Like 2x - 4 Equals 2, for example.
To find the number of servings that can be obtained from the can, we need to divide the total weight of vegetables in the can by the weight of one serving:
Number of servings = (15/16) ÷ (1/4)
= (15/16) × (4/1)
= 60/16
= 15/4
Therefore, the number of servings that can be obtained from the can is 15/4.
None of the answer choices match this result exactly, but we can simplify 15/4 to 3 3/4, which is answer choice D.
So the answer is D. 3 3/4.
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2. Two-tailed hypothesis testing - Step by step
S-adenosyl methionine (SAM-e) is a naturally occurring compound in human cells that is thought to have an effect on depression symptoms. Suppose that a researcher is interested in testing SAM-e on patients who are struggling with Alzheimer’s. She obtains a sample of n = 30 patients and asks each person to take the suggested dosage each day for 4 weeks. At the end of the 4-week period, each individual takes the Beck Depression Inventory (BDI), which is a 21-item, multiple-choice self-report inventory for measuring the severity of depression.
The scores from the sample produced a mean of M = 28.9 with a standard deviation of s = 5.94. In the general population of Alzheimer’s patients, the standardized test is known to have a population mean of μ = 29.7. Because there are no previous studies using SAM-e with this population, the researcher doesn’t know how it will affect these patients; therefore, she uses a two-tailed single-sample t test to test the hypothesis.
From the following, select the correct null and alternative hypotheses for this study:
H₀: μSAM-e
≥ 29.7; H₁: μSAM-e
< 29.7
H₀: MSAM-e
≥ 29.7; H₁: MSAM-e
< 29.7
H₀: μSAM-e
= 29.7; H₁: μSAM-e
≠ 29.7
H₀: MSAM-e
≥ 29.7; H₁: MSAM-e
> 29.7
Assume that the depression scores among patients taking SAM-e are normally distributed. You will first need to determine the degrees of freedom. There are degrees of freedom.
Use the t distribution table to find the critical region for α = 0.01.
The t Distribution:
df
Proportion in One Tail
0.25
0.10
0.05
0.025
0.01
0.005
Proportion in Two Tails Combined
0.50
0.20
0.10
0.05
0.02
0.01
1 1.000 3.078 6.314 12.706 31.821 63.657
2 0.816 1.886 2.920 4.303 6.965 9.925
3 0.765 1.638 2.353 3.182 4.541 5.841
4 0.741 1.533 2.132 2.776 3.747 4.604
5 0.727 1.476 2.015 2.571 3.365 4.032
6 0.718 1.440 1.943 2.447 3.143 3.707
7 0.711 1.415 1.895 2.365 2.998 3.499
8 0.706 1.397 1.860 2.306 2.896 3.355
9 0.703 1.383 1.833 2.262 2.821 3.250
10 0.700 1.372 1.812 2.228 2.764 3.169
11 0.697 1.363 1.796 2.201 2.718 3.106
12 0.695 1.356 1.782 2.179 2.681 3.055
13 0.694 1.350 1.771 2.160 2.650 3.012
14 0.692 1.345 1.761 2.145 2.624 2.977
15 0.691 1.341 1.753 2.131 2.602 2.947
16 0.690 1.337 1.746 2.120 2.583 2.921
17 0.689 1.333 1.740 2.110 2.567 2.898
18 0.688 1.330 1.734 2.101 2.552 2.878
19 0.688 1.328 1.729 2.093 2.539 2.861
20 0.687 1.325 1.725 2.086 2.528 2.845
21 0.686 1.323 1.721 2.080 2.518 2.831
22 0.686 1.321 1.717 2.074 2.508 2.819
23 0.685 1.319 1.714 2.069 2.500 2.807
24 0.685 1.318 1.711 2.064 2.492 2.797
25 0.684 1.316 1.708 2.060 2.485 2.787
26 0.684 1.315 1.706 2.056 2.479 2.779
27 0.684 1.314 1.703 2.052 2.473 2.771
28 0.683 1.313 1.701 2.048 2.467 2.763
29 0.683 1.311 1.699 2.045 2.462 2.756
30 0.683 1.310 1.697 2.042 2.457 2.750
40 0.681 1.303 1.684 2.021 2.423 2.704
60 0.679 1.296 1.671 2.000 2.390 2.660
120 0.677 1.289 1.658 1.980 2.358 2.617
∞ 0.674 1.282 1.645 1.960 2.326 2.576
The critical t scores (the values that define the borders of the critical region) are .
The estimated standard error is .
The t statistic is .
The t statistic in the critical region. Therefore, the null hypothesis rejected.
Therefore, the researcher conclude that SAM-e has a significant effect on the moods of Alzheimer’s patients.
Therefore, the researcher can conclude that SAM-e has a significant effect on the moods of Alzheimer's patients.
How to solveGiven:
[tex]n = 30, \bar{X} = 26.2, \mu = 28.1, S = 2.97, \alpha = 0.01[/tex]
Hypothesis:
[tex]ANSWER: D. H0: \muSAM-e = 28.1; Ha: \muSAM-e \neq 28.1[/tex]
Degrees of Freedom = n-1 = 30-1 = 29
The critical t scores are:
[tex]t\alpha/2, n-1= t0.01/2, 30-1 = \pm 2.7564[/tex]
The estimated standard error is: [tex]S/\sqrt{n} = 2.97/\sqrt{30} = 0.5422[/tex]
Test statistic:
[tex]t = \frac{\bar{X} - \mu }{S/\sqrt{n}} = \frac{26.2 - 28.1}{2.97/\sqrt{30}} = -3.50[/tex]
[tex]|t| > t\alpha/2, n-1 , i.e 3.50 > 2.7564, Reject H0 at 1% level of significance.[/tex]
The t-statistic lies in the critical region. Therefore, the null hypothesis is Rejected
Therefore, the researcher can conclude that SAM-e has a significant effect on the moods of Alzheimer's patients.
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Question 4
Consider the parabola given by the equation f(x) = -x²+2x+6
Find the following for this parabola:
A) The value of f(-1) is
B) The vertex is
C) The y-intercept is the point
Answer:
A) f(-1) = 3
B) Vertex: (1;9)
C) y = 6
Step-by-step explanation:
Given:
[tex] f(x) = - {x}^{2} + 2x + 6[/tex]
a = -1, b = 2, c = 6
A) Replace the x with -1 in this function:
[tex]f( - 1) = - ({ - 1})^{2} + 2 \times ( - 1) + 6 = - 1 - 2 + 6 = 3[/tex]
.
B) First, let's find x vertex and then replace x with its vertex value in the given function to find y vertex:
[tex]x(vertex) = \frac{ - b}{2a} = \frac{ - 2}{2 \times ( - 1)} = \frac{ - 2}{ - 2} = 1[/tex]
[tex]y(vertex) = {1}^{2} + 2 \times 1 + 6 = 9[/tex]
Vertex: (1;9)
.
C) The parabola will cross the y-axis when x is zero (replace x with 0 in the given function):
[tex] - {0}^{2} + 2 \times 0 + 6 = 0 + 0 + 6 = 6[/tex]
y = 6
If y varies inversely as X and y=16 when X=4,find y when X=32
[tex]\qquad \qquad \textit{inverse proportional variation} \\\\ \textit{\underline{y} varies inversely with \underline{x}} ~\hspace{6em} \stackrel{\textit{constant of variation}}{y=\cfrac{\stackrel{\downarrow }{k}}{x}~\hfill } \\\\ \textit{\underline{x} varies inversely with }\underline{z^5} ~\hspace{5.5em} \stackrel{\textit{constant of variation}}{x=\cfrac{\stackrel{\downarrow }{k}}{z^5}~\hfill } \\\\[-0.35em] ~\dotfill[/tex]
[tex]\stackrel{\textit{"y" varies inversely with "x"}}{y = \cfrac{k}{x}}\hspace{5em}\textit{we also know that} \begin{cases} x=4\\ y=16 \end{cases} \\\\\\ 16=\cfrac{k}{4}\implies 64 = k\hspace{9em}\boxed{y=\cfrac{64}{x}} \\\\\\ \textit{when x = 32, what's "y"?}\qquad y=\cfrac{64}{32}\implies y=2[/tex]
Please answer step 1 and step 2
Joel needs to practice for another 9/4 hours or 2 1/4 hours to meet his goal.
How to calculate how many hours does Joel need to practice this week to meet his goal?To solve the problem, we need to add up the number of hours Joel has practiced so far and subtract it from his goal of 4 1/2 hours per week.
First, we need to convert the mixed numbers to improper fractions:
Monday: 1 1/2 hours = 3/2 hoursWednesday: 1 1/4 hours = 5/4 hoursThursday: 1 hour = 4/4 hoursNext, we add the fractions:
3/2 + 5/4 + 4/4 = 6/4 + 5/4 + 4/4 = 15/4
So far, Joel has practiced for 15/4 hours this week.
To find out how many more hours he needs to practice to meet his goal, we subtract 15/4 from 4 1/2:
4 1/2 - 15/4
We need to make the denominators the same by finding a common denominator of 4:
4 2/2 - 15/4 = 9/4
Therefore, Joel needs to practice for another 9/4 hours or 2 1/4 hours to meet his goal.
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Which steps should be used to compare the fractions 2/9 and 5/6?
A- Find a common numerator.
B- Add the numerators and denominators to determine which sum is larger.
C- Use the "greater than" symbol to show which denominator is larger.
D- Multiply the first fraction by 2/2 and the second fraction by 3/3
Answer: D- Multiply the first fraction by 2/2 and the second fraction by 3/3
Step-by-step explanation:
A) You never find the common numerator only denominator
B) Not logical
C) You would have to compare the fractions first
D) 2/9 * 2/2 = 4/18
5/6 * 3/3 = 15/18
5/6 is greater. This is the best way to compare the fractions, and so, Answer Choice (D) is the best option.
Help me please help me I really need to knowwhat order
The ascending order of the fraction is 70/11, 51/8, 62/7, 85/9.
What is ascending order?Ascending order is a method of arranging numbers from smallest value to largest value.
For example, arranging , 3,1,2,5,6,8,4 in ascending order, we start from the least, which is 1 and ends with the greatest which is 8 i.e 1,2,3,4,5,6,8
To actually know the least and the greatest we will have find the value of each fraction.
62/7 = 8.86
51/8 = 6.38
85/9 = 9.44
70/11 = 6.36
Therefore , with the values found the arrangement from least to the greatest is
70/11, 51/8, 62/7, 85/9
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