Please someone help me. i really dont get this. If you help i give 40 POINTS Please help me
Answers
Answer:
Only Carla's
Step-by-step explanation:
I believe the answer is only Carla's because even though the left side is factored, there is still an 8 on the right side. To apply the zero product property rule, the equation needs to equal 0
Meanwhile Carla's works because then the equation would be x²=9 which we can easily take the square root of
Answer: Only Carla
Step-by-step explanation:
Only Carla
Carla said:
(x+1)(x-1)=8 FOIL
x²-1=8
x²=9
x=±3
Jordan said:
He will use 0 property rule but the factored portion must =0 It equals 8, so you can't use that property.
Related Questions
Suppose Manuela flips a coin three times. What is the theoretical probability of flipping tails at least two times? Express your answer as a fraction in simplest form.
Answers
The probability of flipping tails at least two times in three flips is 1/2.
When flipping a coin, there are two possible outcomes: heads or tails. Each flip is independent of the previous flips, so the probability of getting tails on any given flip is always 1/2 (assuming the coin is fair).
To find the theoretical probability of flipping tails at least two times in three flips, we can use the binomial probability formula:
P(x ≥ k) = 1 - P(x < k)
where P(x < k) is the probability of getting tails fewer than k times in three flips.
To find P(x < k), we can add up the probabilities of getting tails 0 times and getting tails 1 time:
P(x < 2) = P(0 tails) + P(1 tail)
P(0 tails) = (1/2)⁰ x (1/2)³ = 1/8
P(1 tail) = 3 x (1/2) (1/2)² = 3/8 (since there are three ways to get exactly one tail: TTH, THT, HTT)
P(x < 2) = 1/8 + 3/8 = 1/2
Therefore, the probability of flipping tails at least two times in three flips is:
P(x ≥ 2) = 1 - P(x < 2) = 1 - 1/2 = 1/2
So the theoretical probability of flipping tails at least two times in three flips is 1/2 or 0.5 as a decimal.
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20x+4y=8 in slope-intercept form, simplifying all fractions.
Answers
slope = -5, y intercept = 2
The graph is below.
======================================
Work Shown:
20x+4y = 8
4y = 8-20x
4y = -20x + 8
y = (-20x+8)/4
y = -20x/4 + 8/4
y = -5x + 2 is the final answer
slope = -5, y intercept = 2
Two points on this line are (0,2) and (1, -3)
The graph is below. I used GeoGebra to make it, but Desmos is another good choice.
Which of the following is a quadratic function? Help ASAP!
Answers
Answer:
B. f(x) = 4x² + x - 3
Step-by-step explanation:
A quadratic is a second-degree polynomial. This means that the highest power that x is raised to is 2.
We can see that option B is the only one that meets this requirement. Option A is a third-power monomial, so it is not a quadratic. Option C is a linear function, so it is not a quadratic.
pleaseee help with mathhhh.
Answers
The value of the expression is 2x³ + 3x² - 27x + 40
How to determine the productIt is important we know that algebraic expressions are described as expressions that are composed of factors, constants, variables, coefficients and terms.
Algebraic expressions are also made up of arithmetic operations, such as;
AdditionBracketParenthesesSubtractionMultiplicationDivisionFrom the information given, we have;
1. (x + 5)(2x² -7x + 8)
expand the bracket
2x³ - 7x² + 8x + 10x² -35x + 40
collect like terms
2x³ - 7x² + 10x² + 8x - 35x + 40
Add the like terms
2x³ + 3x² - 27x + 40
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Makesha lost 60 pounds in 16 weeks. Find her rate of loss in pounds per week
Answers
Her rate loss in pounds per week is given as follows:
3.75 pounds per week.
How to obtain her rate loss?Her rate loss in pounds per week is obtained applying the proportions in the context of the problem.
A proportion is applied as the rate loss is given by the division of the loss by the number of weeks.
The parameters are given as follows:
Loss of 60 pounds.Time of 16 weeks.Hence the rate loss is given as follows:
r = 60/16
r = 3.75 pounds per week.
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Looking at the ping-pong ball toss board below, whats the probability of landing on a white square? (Note the board contains 5 rows of 5 squares.)
Answers
The probability of landing on a white square is 4/5.
We have toss board of measurement 5 x 5.
Total squares in board = 25
White square = 20
Black square= 5
So, the probability of landing on a white square
= 20 / 25
= 4/5
Thus, the required probability is 4/5.
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Five people were asked how many paintings they own. Their answers were as follows:
1,
0, 2,
196,
1
a) Find the mean number of paintings owned by these five people
b) Is the mean a good average to use to describe the number of paintings that these people own? Write a sentence to explain your answer.
Answers
a) The mean number of paintings owned by these five people is 40. b) No, the mean is not a good average to use to describe the number of paintings that these people own
How to find the mean number of paintings owned by these five peoplea) To find the mean number of paintings owned, we add up all the values and divide by the total number of people:
Mean = (1+0+2+196+1)/5 = 40
Therefore, the mean number of paintings owned by these five people is 40.
b) No, The mean is not necessarily a good average to use to describe the number of paintings that these people own.
This is because the data is skewed by the one outlier value of 196, which is much larger than the other values.
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Eloise bought 30 pounds of sand to refill 4 sandboxes at a local park. She is going to put the
same amount of sand in each sandbox. Which statement about this situation is true?
Answers
The amount of sand Eloise will put in each sandbox is 7.5 pounds (30 divided by 4).
What is required in order to determine whether or not an object moves?
O a reference point
O distance
O displacement
O standard units
ہے
Answers
Answer: The correct answer is option A. a reference point.
Step-by-step explanation:
An reference point is required to determine whether or not an object moves.
2. The million-dollar question! Suppose you
want to have $1,500,000 for retirement in
30 years. If you deposit the same amount
each month into an annuity that earns 6%
interest annually (and compounded
monthly),
what is the amount you need to
deposit each month?
Show your work
using the formula.
Answers
The formula to calculate the monthly payment needed to achieve a future value in an annuity is:
PMT = FV * (r / 12) / [(1 + r / 12)^(n * 12) - 1]
where PMT is the monthly payment, FV is the future value, r is the annual interest rate (as a decimal), and n is the number of years.
In this case, FV = $1,500,000, r = 0.06, and n = 30. Plugging these values into the formula, we get:
PMT = $1,500,000 * (0.06 / 12) / [(1 + 0.06 / 12)^(30 * 12) - 1]
PMT = $1,500,000 * 0.005 / [1.06^(360) - 1]
PMT = $1,500,000 * 0.005 / 5.743
PMT = $1,244.23 (rounded to the nearest cent)
Therefore, the amount that needs to be deposited each month to achieve a future value of $1,500,000 in 30 years is $1,244.23.
Answer:
the guys above me is correct
Step-by-step explanation:
because i did it and the answer was correct for me
of 2
Analysis Your friend says that the surface area of the prism is 148 square units. Use a net to find the correct surface area. What mistake might your friend have
5
3
17
4
(The figure is not to scale)
Answers
Using the net, the correct surface area of the prism is 216 square units
Using a net to find the correct surface areaFrom the question, we have the following parameters that can be used in our computation:
The triangular prism
Using the net, the surface area is
Surface area = Sum of areas of individual shapes
So, we have
Surface area = 2 * 1/2 * 3 * 4 + 17 * 5 + 17 * 4 + 17 * 3
Evaluate
Surface area = 216
Hence, the surface area of the prism is 216 square units
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An object has been heated to 135
degree Fahrenheit. After 2 minutes
it has cooled to 71 degrees. The
ambient temperature is 60 degrees.
Rounded to the nearest tenth, what
will the temperature of the object be
at the end of 5 minutes?
[?] degrees Fahrenheit
Entor
Answers
The temperature at the end of 5 minutes is given as 87.09 F
How to solve for temperature71 = 60 + (135 - 60) * e^(-2k)
11 = 75 * e^(-2k)
e^(-2k) = 11/75
-2k = ln(11/75)
k = -0.5 * ln(11/75) ≈ 0.2036
Now we have the value of k, we can find the temperature of the object at the end of 5 minutes, T(5):
T(5) = 60 + (135 - 60) * e^(-0.2036 * 5)
T(5) = 60 + 75 * e^(-1.018)
T(5) ≈ 60 + 75 * 0.3612
T(5) ≈ 60 + 27.09
T(5) ≈ 87.09
The temperature at the end of 5 minutes is given as 87.09 F
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1/3 of Murkas age is twice as much as Ivans age. What is the ratio of murkas age to ivans age?
Answers
The ratio of Murkas age to Ivans age is M : I = 6 : 1
Given data ,
Let Murkas age be M and Ivans age be I
Given that 1/3 of Murka's age is twice as much as Ivan's age
So ,
1/3 ( M ) = 2 ( I )
On simplifying the proportion , we get
Multiply by 3 on both sides , we get
M = 6 ( I )
Divide by I on both sides , we get
M / I = 6
Hence , the proportion is 6 : 1
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Find the surface area of the figure below. Round to the nearest 10th.
Answers
The surface area of the given composite figure is: 484.38 cm²
How to find the surface Area?The formula for the area of a rectangle is:
Area = Length * Width
The formula for the area of a square is:
Area = side * side
The surface area is simply the area of each of the surfaces of the figure.
Thus, surface area of the given composite figure is:
4(13 * 10) + (10 * 10) + (10 * 10) - 3π(5²))
= 484.38 cm²
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What is an equation of a line, in point-slope form, that passes through (1, −7) and has a slope of −2/3? A: y+7=2/3(x+1) B: y+7=−2/3(x−1) C: y−7=2/3(x−1) D: y−7=−2/3(x+1)
PLEASEEE help ima trying to get my work out the way
Answers
The equation of the line in point-slope form that passes through (1, -7) and has a slope of -2/3 is y + 7 = -2/3(x-1). Correct option is B.
The point-slope form of a linear equation is given by:
y - y₁ = m(x - x₁)
where m is the slope of the line and (x₁, y₁) is a point on the line.
We are given a point (1, -7) that the line passes through and a slope of -2/3. Therefore, we can substitute these values into the point-slope form equation to obtain:
y - (-7) = (-2/3)(x - 1)
Simplifying this equation, we get:
y + 7 = (-2/3)x + (2/3)
Taking 2/3 common from right sides, we get:
y + 7 = -2/3(x-1)
Therefore, Correct option is B.
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Need help with this please. Be creative!!
Answers
The picture for reduction and enlargement is attached
What is scale factor?Scale factors are used to increase or decrease image. The situation of increment is usually called magnifying. while that of decrease is reduction.
The drawing of the the reduction is a square of side 8 units. The scale factor given is 1/2 hence we have the dimensions are as follows
preimage: 8 units x 8 units
image: 4 units x 4 units
The drawing of the the enlargement is a circle of radius 2 units. The scale factor given is 2, hence we have the dimensions are as follows
preimage: radius = 2 units
image: radius = 4 units
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Let h(x) = x² - 8x.
(a) Find the average rate of change from 3 to 9.
(b) Find an equation of the secant line containing (3,h(3)) and (9, h(9))
Answers
(a) Find the average rate of change from 3 to 9.
(b) Find an equation of the secant line containing (3,h(3)) and (9, h(9))
your avatar
(a) The average rate of change from 3 to 9 can be found by calculating the slope of the secant line connecting the points (3, h(3)) and (9, h(9)).
The formula for the slope of a line passing through two points (x1, y1) and (x2, y2) is:
m = (y2 - y1) / (x2 - x1)
Applying this formula, we have:
m = (h(9) - h(3)) / (9 - 3)
To find the values of h(9) and h(3), we need to substitute 9 and 3 into the function h:
h(9) = 9² - 8(9) = -27 h(3) = 3² - 8(3) = -9
Substituting into the formula for slope, we have:
m = (-27 - (-9)) / (9 - 3) = -18 / 6 = -3
Therefore, the average rate of change from 3 to 9 is -3.
(b) To find the equation of the secant line containing (3, h(3)) and (9, h(9)), we need to find the slope of the line and its y-intercept.
We've already calculated the slope in part (a) as -3. To find the y-intercept, we can use the point-slope form of a line:
y - y1 = m(x - x1)
where m is the slope, (x1, y1) is a point on the line, and (x, y) are any other points on the line. We can choose either (3, h(3)) or (9, h(9)) as our point.
Let's use (3, h(3)):
y - h(3) = -3(x - 3)
Simplifying, we get:
y = -3x + 18 - 9 y = -3x + 9
Therefore, the equation of the secant line is y = -3x + 9.
Dr. Suarez, a veterinarian, wants to estimate the average number of
calories a chihuahua typically eats in a day. She'll take a sample of n
chihuahuas and create a 99% confidence interval for the mean daily caloric
intake. She wants the margin of error to be no more than 8 calories. A pilot
study suggests that the daily caloric intake of chihuahuas has a standard
deviation of 30 calories.
Which of these is the smallest approximate sample size required to obtain
the desired margin of error?
Choose 1 answer:
Answers
The smallest approximate sample size required to obtain the desired margin of error is b. 180 Chihuahuas
What is the sample size?The sample size is defined as the number of observations used for determining the estimations of a given population. It should be noted that the size of the sample has been drawn from the population. Sampling is the process of selection of a subset of individuals from the population to estimate the characteristics of the whole population.
The sample size will be:
= (2.576 × 26 / 5)²
= 180
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Find the area of the region described
The region in the first quadrant bounded by y=x^2/5 and y=1
Answers
The area of the curve in the first quadrant is A = 2/7 units²
Given data ,
Let the region described is bounded by the curves y = x^(2/5) and y = 1 be in the first quadrant
Now , the point of intersection of these two curves is given by
x^(2/5) = 1
x = 1^5
So the two curves intersect at x = 1
Now , the area of the curve is given by y = x^(2/5) is the lower curve and y = 1 is the upper curve in the given interval [0, 1]
And , the , integral is used to find the area
∫[from 0 to 1] (1 - x^(2/5)) dx
∫(1 - x^(2/5)) dx = x - (5/7)x^(7/5) + C
Evaluated from 0 to 1, we get:
[(1 - (5/7)(1^(7/5))) - (0 - (5/7)(0^(7/5)))]
Simplifying further, we get:
[(1 - 5/7) - 0] = 2/7 units²
Hence , the area of the region bounded by the curves y = x^(2/5) and y = 1 in the first quadrant is 2/7 square units
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(y)/(3.4)+4.1=2.5
whats y
Answers
Answer:
-5.44
Step-by-step explanation:
Y/3.4+4.1 =2.5
Y+(3. 4)(4.1)/(3.4)=2.5
Y+13.94/3.4 =2.5 cross multiply (3.4)(2.5)to get
Y+13.94=8.5
Y=8.5-13.94
= (-5.44)
Bacteria in a dirty glass triple 4 hours. If there are 25 bacteria to start, how many in the glass
after 1 day?
Answers
If the number of bacteria triples every 4 hours, then after 1 day (24 hours), the number of bacteria will triple 6 times.
Tripling a number 6 times is the same as multiplying it by 3 raised to the power of 6, or 3^6.
So, if there are 25 bacteria to start, the number of bacteria after 1 day will be:
25 x 3^6 = 25 x 729 = 18,225 bacteria.
Answer:
Step-by-step explanation:
It is not possible to accurately determine the number of bacteria in the glass after 4 hours without additional information such as the rate of bacterial growth, the environmental conditions, and whether any bacteria were removed or added during that time.
HELP ME ALSO WITH THIS!!!!!
Answers
Explanation:
Start by multiplying both sides of the second equation by -2. Now line up both equations and add them to each other. Since the 2y and -2y cancel out, you are left with -10x = -60. Thus, you get x = 6 and can plug it back in to either equation to solve for y. After that, you are left with the solution (6,3).
select all the equations that are equivalent to 81x^2+180x-200=100
Answers
The factorized form of the equation is 3((3x + 10)(9x - 10) ) = 0.
What is the simplification of the equation?
The given quadratic equation is simplified as follows;
81x² + 180x - 200 = 100
Collect similar terms together;
81x² + 180x = 100 + 200
81x² + 180x = 300
81x² + 180x - 300 = 0
Factorize the equation by using a common factor;
3(27x² + 60x - 100) = 0
Factorize further as follows;
3(27x² + 90x - 30x - 100) = 0
3( 9x (3x + 10) - 10(3x + 10) )= 0
3((3x + 10)(9x - 10) ) = 0
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What's the ordered pair so that's a solution for the given linear equation?
6x+4y=8
(-1, __ )
(__,-4)
Thanks!
Answers
The ordered pairs to a solution for the given linear equation are (-1, 3.5) and (4, -4).
To find the ordered pair that is a solution to the equation 6x + 4y = 8, we can substitute the given value of x or y and solve for the other variable.
For the first option, substituting x = -1, we get:
6(-1) + 4y = 8
-6 + 4y = 8
4y = 14
y = 3.5
So, the ordered pair (-1, 3.5) is a solution to the equation.
For the second option, substituting y = -4, we get:
6x + 4(-4) = 8
6x - 16 = 8
6x = 24
x = 4
So, the ordered pair (4, -4) is a solution to the equation.
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help me please quickly
Answers
the answer is B
B
because the answer B make the most sense to me and hopefully this helps
Pythagoras theorem: In a right triangle, if the hypotenuse, perpendicular, and base are its sides, then as per the theorem, the square of the hypotenuse side is equal to the sum of the square of the base and the square of the perpendicular. Hence, if we know any two sides, then we can easily find the third side of the triangle.
C. 20 ft, 20 ft, 50 ft correct?
HELPPP ASAPPP !!!
2. Point A on the graph below represents Nate's house, and Point B represents Nate's favorite restaurant. B A If each unit on the graph represents 3/4 of a mile, how many miles does Nate live from his favorite restaurant?
Answers
Answer:
10miles I think
Step-by-step explanation:
The required distance between, Nate's house and the restaurant is 7.5 miles.
From the graph,
Consider point C on the graph, which is 6 and 8 units apart from A and B respectively.
The distance between, Nate's house and the restaurant is given as,
AB = √[AC² + BC²]
AB = √[6² + 8²]
AB = 10 units
Now 1 unit = 3/4 miles
AB = 10 * 3/4
AB = 7.5 miles
Thus, the required distance between, Nate's house and the restaurant is 7.5 miles.
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You need to arrange 7 of your favorite books along a small shelf. How many different ways can you arrange the books, assuming that the order of the books makes a difference to you?
Answers
There are 5,040 different ways you can arrange your 7 favorite books on the small shelf.
The organization or positioning of a group of items or components in relation to one another is referred to as an arrangement. It can be used in a variety of situations, such as mathematics, art, or event planning, and can relate to the arrangement, positioning, or grouping of things.
The number of different ways you can arrange 7 books in a specific order is given by the permutation formula:
P(7,7) = 7!
where "!" denotes the factorial operation.
Thus, the number of ways you can arrange your 7 favorite books along a small shelf, assuming that the order of the books makes a difference to you, is:
7! = 7 x 6 x 5 x 4 x 3 x 2 x 1 = 5,040
Therefore, there are 5,040 different ways you can arrange your 7 favorite books on the small shelf.
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You would like to start saving for retirement. Assuming you are now 25 years old and you want to retire at age 55, you have 30 years to watch your investment grow. You decide to invest in the stock market, which has earned about 13% per year over the past 80 years and is expected to continue at this rate. You decide to invest $2,000 at the end of each year for the next 30 years.
Answers
If you invest $2,000 at the end of each year for the next 30 years and earn an annual rate of return of 13%, you would have a total of approximately $75,994.18 saved for retirement.
To calculate the future value of the investment, we can use the formula for the future value of an annuity:
[tex]FV = PMT \times \dfrac{((1 + r)^{n - 1})} { r}[/tex]
where PMT is the annual payment, r is the annual interest rate, and n is the number of periods.
In this case, we have PMT = $2,000, r = 0.13 (since the stock market has earned 13% per year), and n = 30 (since we are investing for 30 years).
Plugging in the values, we get:
FV = $2,000 x ((1 + 0.13)³⁰ - 1) / 0.13
= $2,000 x (4,919.04) / 0.13
= $75,994.18
Therefore, a total of about $75,994.18 would be saved for retirement if you invested $2,000 at the end of each year for the next 30 years and saw a 13% annual return.
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PLEASE HELP
What is the difference between the median math test score in the morning and the
afternoon?
Answers
Answer:
difference = 12.5
Step-by-step explanation:
the median score is the value of the line inside the box.
median in afternoon = 75
median in morning = 87.5
difference = 87.5 - 75 = 12.5
(Scatterplots/Line of Best Fit) Jason designed an electronic system for a class
project. He recorded the temperature of the system over several minutes of
usage, shown in the table below. If the temperature is approximately 48 degrees,
how many minutes of usage did he record?
Answers
The most likely number of minutes of usage recorded by Jason is A . approximately 50.
How to find the minutes of usage ?We can see that initially, the temperature of the electronic system began to increase as the time increased. It then began to decrease from the 20 minute and ketp decreasing till the 40th minute.
Assuming that the temperature keeps decreasing, it would mean that at 50 minutes, the temperature would be more than the temperature at 40 minutes and so would most likely be 48 degrees.
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