In accordance with algebra properties and relationship between logarithms and powers, the logarithm ㏒ₐ (108 / a³) is equal to the pseudolinear expression 2 · b + 3 · c - 3.
How to solve a logarithmic expression
In this problem we must determine the base of a given set of logarithms by using algebra properties and relationships between powers and logarithms. Now we proceed to solve:
Step 1 - We get the following equations:
㏒ₐ 2 = b, ㏒ₐ 3 = c
Step 2 - Now we add the other logarithm:
㏒ₐ (108 / a³)
Step 3 - By logarithm properties:
㏒ₐ 108 - ㏒ₐ a³
㏒ₐ (2² · 3³) - 3 · ㏒ₐ a
㏒ₐ 2² + ㏒ₐ 3³ - 3 · 1
2 · ㏒ₐ 2 + 3 · ㏒ₐ 3 - 3
Step 4 - By Step 1:
2 · b + 3 · c - 3
The logarithm ㏒ₐ (108 / a³) is equivalent to 2 · b + 3 · c - 3.
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-9 ( x + 6)= -9x + 108
Answer: 0=1620=162
PLEASE GIVE BRAINLIEST THANK YOU VERY MUCH!!
Note: Enter your answer and show all the steps that you use to solve this problem in the space provided. Solve. 4 x + 6 < − 6
The solution to the inequality 4x + 6 ∠ -6 is x ∠ -3
What is an inequality?inequality shows the relationship between two values in an algebraic expression that are not equal. Inequality signs can indicate that one variable of the two sides of the inequality is greater than, greater than or equal to, less than, or less than or equal to another value.
4x + 6 ∠ -6
taking 6 to the right hand side of the inequality
4x < -6 -6
4x < -12
divide both sides by 4
x < -12/4
x < -3
In conclusion, x < -3 is the solution to the Algebraic expression above.
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What are the coordinates of the centroid of a triangle with vertices X(−4, 0) , Y(−1, 4) , and Z(2, 2) ?
Enter your answer by filling in the boxes.
(
,
)
The coordinates of the centroid of a triangle with vertices X(−4, 0) , Y(−1, 4) , and Z(2, 2) is; (x, y) = (-1, 2)
What are the coordinates of the triangle centroid?Centroid of a Triangle states that the center of the triangle can be calculated as the point of intersection of all the three medians of that same triangle, and that this median is a line drawn right from the midpoint of one side to the opposite vertex.
We are given the coordinate of the vertices of the triangle as;
X(−4, 0) , Y(−1, 4) , and Z(2, 2)
Now, the formula to find the coordinates of the centroid of the triangle is; (x, y) = (x₁ + x₂ + x₃)/3, (y₁ + y₂ + y₃)/3
Thus, the coordinates of the Centroid is;
(x, y) = (-4 + (-1) + (2))/3, (0 + 4 + 2)/3
(x, y) = (-1, 2)
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four people (john, paul, george, and ringo) are seated in a row on a bench. the number of ways to order the four people so that john is next to paul is 12. how many ways are there to order the four people on the bench so that john is not next to paul?
The Number of ways that four people can be seated on the bench so that john is not next to paul is 12
Permutations :
In mathematics, An arrangement of things or items in a specific sequence is known as a permutation. One should think about both the selection and the arrangement while dealing with permutation. In permutations, ordering is crucially important.
The arrangement of n items in r ways is given by
ⁿPr = n! /(n-r)!Here we have
4 people (John, Paul, George, and Ringo) are seated in a row on a bench
Here total No of ways that 4 can be seated = 4 × 3 × 2 × 1 = 24
The number of ways of seating the four people so that john is next to paul is 12
Then the number of ways the four people on the bench so that john is not next to paul can find as given below
= Total No of ways, 4 can be seated - No of ways that john next to paul
= 24 - 12 = 12
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Determine the coordinates of the preimage given the image below and the composition of a rotation 180 about the origin and a translation 3
units up.
The coordinates of the preimage given in the image below and the composition of a rotation 180 about the origin and a translation 3 units up are: (2, -3), (3, 1), and (-5, 0).
What is a rotation?In Geometry, the rotation of a geometric figure 180° about the origin in a clockwise or counterclockwise direction would produce a point that has the coordinates (-x, -y).
From the graph of the image of triangle A'B'C', we have the following coordinates and they would be reversed to obtain the coordinate of triangle ABC before a translation:
(-x, -y) → (x, y)
Points at A' = (-2, 5) → Points at A = (2, -5)
Points at B' = (-3, 1) → Points at B = (3, -1)
Points at C' = (5, 2) → Points at C = (-5, -2)
Next, we would apply a translation of 3 units up:
Points at A = (2, -5) → (2, -5 + 2) = (2, -3)
Points at B = (3, -1) → (3, -1 + 2) = (3, 1)
Points at C = (-5, -2) → (-5, -2 + 2) = (-5, 0)
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You have 8,560 grams of a radioactive kind of rubidium. If its half-life is 15 minutes, how
much will be left after 45 minutes?
grams
Answer:
1,070 g
Step-by-step explanation:
Half-life is the length of time it takes for half of the radioactive atoms of a radionuclide to decay. In this scenario, the amount of radioactive atoms is halved after 15 minutes. After 45 minutes, then, the amount of radioactive atoms is halved three times. Therefore:
1st half-life: 8,560 ÷ 2 = 4,280 g
2nd half-life: 4,280 ÷ 2 = 2,140 g
3rd half-life: 2,140 ÷ 2 = 1,070 g
What are the solutions to the equation?
Finding the value of the given equation's unknown variables is a step in the equation-solving process. The value of the variable satisfies the requirement that the two expressions are equal and is called the solution of that equation.
What Does Solving Equations Mean?Calculating the value of the unknown variable while keeping the equation balanced on both sides is the process of solving equations. When a condition on variable guarantees that two expressions in the variable have the same value, it qualifies as an equation.
The variable's value for which the equation holds true is referred to as the equation's solution If the LHS and RHS are switched, an equation doesn't change. The answer is discovered after isolating the variable for which the value must be determined. Depending on the kind of equation we are working with, we can solve it. There are several types of equations, including linear, quadratic, rational, and radical ones.
When a linear equation has one variable, there is only one solution; when there are two variables, there are two solutions. A quadratic equation's solution yields two roots. To solve an equation, a variety of techniques and steps are used.
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is y=4x-8, continuous or discrete?
The equation y = 4x - 8 is discrete
What are discrete data?Discrete data is a sort of numerical information that consists of full, concrete numbers with predetermined, set values that can be counted.
While complex numbers and fluctuating data values taken over a predetermined period of time are examples of continuous data.
The difference between discrete and continuous dataThe main distinction between continuous and discrete data is that the former has a finite value that can be counted while the latter has an endless number of possible values that can be measured.
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Given that D( x ) = 2 x , select all of the following that are true statements. D( x ) is a direct variation. D( x ) is a function. D( x ) is a rule for the set of points (5, 10), (6, 12) and (-2, -4). x is the dependent variable. D(6) = 3 1 Attempts Remain
The true statements are:
D(x) is a rule for the set of points (5, 10), (6, 12) and (-2, -4).D(x) is a direct variation.x is the dependent variable.D(x) is a function.How to determine the true statements?The function is given as D(x) = 2x
The function D(x) is a linear function, and it is also a proportional function
Proportional functions represent direct variation
This means that (b) and (e) are true
Also set x = 5, 6 and -2
So, we have the following equations
D(5) = 2 x 5 = 10
D(6) = 2 x 6 = 12
D(-2) = 2 x -2 = -4
This means that (a) is true
Lastly, the function D(x) is dependent on x for its value
This means that x is the dependent variable.
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The difference between an Arithmetic Sequence and a Linear
Function:
O The Linear Function has a y-intercept.
O All the points on a Linear Function connect.
O The Domain of the Linear Function includes negative numbers.
O All of the above
All the statements about Arithmetic sequence and linear function are correct.
What is Arithmetic sequence and linear function?
When used in mathematics, the term "linear function" describes two different but related ideas: A linear function, also known as a polynomial function of degree zero or one, is a function in calculus and related fields that has a graph that is a straight line.
In an Arithmetic Sequence the difference between one term and the next is a constant. In other words, we just add the same value each time.
Since the Linear Function has a y-intercept.
Also all the points on a Linear Function connect.
When a line slopes down from left to right, it has a negative slope. This means that a negative change in y is associated with a positive change in x.
That means the Domain of the Linear Function includes negative numbers when the function is decreasing.
Therefore, all the statements are correct.
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Write the equation of
the circle with diameter
endpoints of (17, -3) and
(-13,3). PLEASE HELP
The equation of the circle with diameter endpoints of (17, -3) and(-13,3) is (x-2)²+y²=936
What is meant by a circle?A circle is a form made up of all points on a plane that are at the same distance from the center. In other words, it is the curve that a moving point in a plane creates to keep its distance from a specific point constant. The radius is the separation between any point on a circle and its center. The radius must typically be a positive integer. Degenerate cases include circles with displaystyle r=0 and r=0. Unless otherwise stated, this article discusses circles in Euclidean geometry, specifically the Euclidean plane.
A circle is a straight forward closed curve that splits the plane into its inner and outside. In regular use, the
The equation of a circle is given as,
(x-a)²+(y-b)=r²
Here, the center of the circle is (a ,b) and r is the radius of the circle
The circle's center can be located first. The middle point of the line segment serves as the center of the circle since the two locations from the issue are the endpoints of a diameter.
Given two end points, how do you calculate a line's midpoint? You may use the formula below.
M=((x1+x2)/2, (y1+y2)/2)
Here, M denotes the mid-point
The points are taken as (x1, y1), (x2, y2)
M=((17-13)/2, (-3+3)/2)
M=(2,0)
Now, the center of the circle is (2,0)
We have to calculate the distance
d= √(x₁-x₂)²+(y₁-y₂)²
d= √(17+13)²+(-3-3)²
d=√900+36
d=√936
Therefore, the radius of the circle is √936
Now, the equation of the circle is,
(x-2)²+(y-0)²= (√936)²
(x-2)²+y²=936
Therefore, the equation of the circle with diameter endpoints of (17, -3) and(-13,3) is (x-2)²+y²=936
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the square root of $x$ is greater than 3 and less than 4. how many integer values of $x$ satisfy this condition?
6 integers that satisfy the given condition are 10,11,12,13,14,15.
Inequality is a relation that makes a non-equal comparison between two numbers or other mathematical expressions. It is used most often to compare two numbers on the number line by their size
we have the number X
Of which the square root is greater than 3 and less than 4
so,
[tex]3 < \sqrt{X} < 4[/tex]
on squaring both sides
[tex]3^2 < (\sqrt{X})^{2} < 4^2[/tex]
[tex]9 < X < 16[/tex]
so the integer that satisfies the condition is 10,11,12,13,14,15.
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Answer:
6
Step-by-step explanation:
Because 4 > √x > 3, we know that 16 > x > 9. Thus, the integers from 10 to 15 inclusive satisfy this inequality, which means 6 integers satisfy the condition in the problem.
work out the circumferecnce of this cricle take π to be 3.142 and write down all the digits given by your calculator 16.8cm
The circumference of the circle with a radius of 16.8 cm is 105.504 cm
How to calculate the circumference?The given parameters are
Radius = 16.8 cm
As a general rule, radius are represented by the variable r
So, we have the following representation equation
r = 16.8 cm
The circumference of the circle is then calculated as
C = 2πr
Next, we substitute the value of the variable r in the above equation
i.e. r = 16.8 cm
So, we have the following equation
C = 2π * 16.8 cm
From the question, we have
π = 3.14
So, we have the following equation
C = 2 * 3.14 *16.8 cm
Evaluate the products
So, we have the following equation
C = 6.28 *16.8 cm
Evaluate the products
C = 105.504 cm
Hence, the circumference is 105.504 cm
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The probability distribution of the random variable X represents the number of hits a baseball player obtained in a game for the 2012 baseball season. x= 0 1 2 3 4 5, P(x)= 0.1666 0.3275 0.2875 0.1489 0.0382 0.0313. The probability distribution was used along with statistical software to simulate 25 repetitions of the experiment (25 games). The number of hits was recorded. Approximate the mean and standard deviation of the random variable X based on the simulation. The simulation was repeated by performing 50 repetitions of the experiment. Approximate the mean and standard deviation of the random variable. Compare your results to the theoretical mean and standard deviation. What property is being illustrated? Compute the theoretical mean of the random variable X for the given probability distribution. (Round to three decimal places as needed.)
For a single game, the mean and the standard deviation of the number of hits is given as follows:
Mean: 1.659 hits.Standard deviation: 1.209 hits.For 25 games, the mean and the standard deviation are:
Mean: 1.659 hits.Standard deviation: 0.242 hits.For 50 games, the mean and the standard deviation are:
Mean: 1.659 hits.Standard deviation: 0.171 hits.This shows that as the number of trials increase, the standard error reduces.
How to obtain the mean and the standard deviation of a discrete distribution?The mean is given by the sum of each outcome multiplied by it's respective probability, hence:
E(X) = 0 x 0.1666 + 1 x 0.3275 + 2 x 0.2875 + 3 x 0.1489 + 4 x 0.0382 + 5 x 0.0313 = 1.659 hits.
The standard deviation is given by the square root of the sum of the differences squared between each observation and the mean, divided by the number of values, hence:
S(X) = sqrt((0-1.659)² x 0.1666 + (1-1.659)² x 0.3275 + (2-1.659)² x 0.2875 + (3-1.659)² x 0.1489 + (4-1.659)² x 0.0382 + (5-1.659)² x 0.0313) = 1.209.
Central Limit TheoremFor the repetition of n experiments, we have that the mean remains constant, while the standard deviation is given as follows:
s = S(X)/sqrt(n).
Meaning that it is divided by the square root of the sample size.
Hence, for 25 games, the standard deviation is:
S(X) = 1.209/sqrt(25) = 0.242.
For 50 games, the standard deviation is:
S(X) = 1.209/sqrt(50) = 0.171.
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Solve the inequalityr divided by negative 2.5 is less than or equal to 8.7 for r.
Answer:
r ≤ -21.75
Step-by-step explanation:
Forming the equation,
→ r ÷ (-2.5) ≤ 8.7
Then the value of r will be,
→ r ÷ (-2.5) ≤ 8.7
→ r ≤ 8.7 × (-2.5)
→ r ≤ -21.75
Hence, value of r is -21.75.
1. 3x^2-7=31
2. 2x^2+18=0
3. 4x^2-26=-50
4. 2x^2+36=x^2
The quadratic equations are solved and answered below -
What is a equation?An equation is a mathematical statement showing the equivalence of two mathematical expressions. Example -
3x + 5 = 8
Given is -
3x² - 7 = 31
2x² + 18 = 0
4x² - 26 = - 50
2x² + 36 = x²
We have -
3x² - 7 = 31
3x² = 38
x² = 38/3
x² = 12.67
x = ±3.56
2x² + 18 = 0
2x² = - 18
x² = -9
x = ±3i
4x² - 26 = - 50
4x² = - 24
x² = -6
x = ±√6i
2x² + 36 = x²
x² = - 36
x = ±√6 i
Therefore, the quadratic equations are solved above.
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Lines n and o are parallel and are cut by the transversal p.
What is the value of x?
Answer:
Step-by-step explanation:
here the alternally exterior angle sum property:
48°+(2x+2)°=180°
⇒2x+2°=180°-48°
⇒2x+2°=132°
⇒2x=130°
⇒x=65°
Owners of a recreation area are filling a small pond with water. They are adding water at a rate of 25 liters per minute. There are 700 liters in the pond to start.
Let W represent the amount of water in the pond (in liters), and let T represent the number of minutes that water has been added. Write an equation relating W to T, and then graph your equation using the axes below.
An equation relating W to T is given by W = 700 + 25T. Also, a graph of this linear equation is shown in the image attached below.
How to write an equation relating W to T?In order to write an equation relating W to T, we would define the variables that represents the amount of water in the pond (in liters) and the number of minutes this water has been added as follows:
Let the variable W represent the amount of water in the pond (in liters).Let the variable T represent the number of minutes that water has been added.The initial volume of water is given by:
700
The volume of water added to this pool would be given by:
25T
Therefore, the total volume of water added to this pool is given by:
W = 700 + 25T
Next, we would determine the points for the graph of this equation:
At T = 0, we have:
W = 700 + 25(0)
W = 700 ⇒ (0, 700)
At T = 1, we have:
W = 700 + 25(1)
W = 725 ⇒ (1, 725)
At T = 2, we have:
W = 700 + 25(2)
W = 750 ⇒ (2, 750)
At T = 3, we have:
W = 700 + 25(3)
W = 775 ⇒ (3, 775)
At T = 4, we have:
W = 700 + 25(4)
W = 800 ⇒ (4, 800)
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Solve for the value of k.
(2k-2)
(k+2)°
Answer:
30
Step-by-step explanation:
( 2k - 2 )°, 90° and ( k + 2 )° are linear pair angles.
Sum of linear pair angle is supplementary ( that is 180 ),
2k - 2 + 90 + k + 2 = 180
2k + k + 90 = 180
3k = 180 - 90
3k = 90
k = 90/3
k = 30
Note : -
□ means 90°
Antoinette spends 3 hours reading each day.
What is the total amount of time (in hours) that
Antoinette spent reading after 6 days?
Answer:
The answer is 18 hours
Step-by-step explanation:
3 hours x 6 days
3x6 = 18
a percentage distribution is given below for the size of families in one u.s. city. size percentage 2 42.8 3 21.1 4 19.2 5 11.6 6 3.3 7 2.0 a family is selected at random. find the probability that the size of the family is 4 or more. round your result to three decimal places.
The probability that the size of the family is 4 or more rounded to three decimal places is 0.361.
Given that families are selected at random, to find the probability that the size of family 4 we need to select and add those probabilities whose family size is more than and equal to 4.
P(X ≥ 4) = P(4) + P(5) + P(6) + P(7)
P(X ≥ 4) = 19.2 + 11.6 + 3.3 + 2.0
P(X ≥ 4) = 36.1
Since we need the answer rounded off to three decimal places, we can divide the answer by 100 which will give the final answer which is 0.361.
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I need help like asap !!!
only numbers and decimal points
Now we have to,
→ find the required value of c.
Formula we use,
→ (AC)² = (BC)² + (AB)²
Then the value of a will be,
→ c² = (8.1)² + (8.1)²
→ c² = 65.61 + 65.61
→ c² = 131.22
→ c = √131.22
→ [ c = 11.46 yd ]
Hence, value of c is 11.46 yd.
Rebekah deposited $1500 in a savings account that pays simple annual
interest. After 21 months, she earns $131.25. What is the interest rate
for her account?
The rate of interest for Rebekah's account is 5.25%
Given,
The principal amount deposited by Rebekah, P = $1500
The time period of the deposit, T = 21 months = 5/3 years
The simple interest she got after 21 months, SI = $131.25
We have to find the rate of interest, R;
Simple Interest;
Simple interest is a quick and simple formula for figuring out how much interest will be charged on a loan. The daily interest rate, the principle, and the number of days between payments are multiplied to calculate simple interest.
Here,
Simple interest, SI = PRT/100
131.25 = (1500 × R × 5/3) / 100
131.25 = 15R × 5/3
131.25 = 25R
R = 131.25/25
R = 5.25%
That is,
The rate of interest for Rebekah's account is 5.25%
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The equation x=-2 is graphed on the coordinate plane shown.
What is the equation of the line perpendicular to x=-2 that passes through (-9,3)?
What is the parallel line and what is the perpendicular line.
We will see that the linear equations are:
Parallel line: x = -9
Perpendicular line: y = 3
How to get the parallel and perpendicular lines?Here we have the vertical line:
x = -2
A parallel line to this one will also be vertical, of the form:
x = a
And a perpendicular line to this one will be horizontal, of the form:
y = b
We want the parallel line to pass through (-9, 3)
So our line x = a needs to pass through that point, then:
x = -9
Is the parallel line.
And if the perpendicular line y = b needs to pass through that point, then:
y = 3
Is the perpendicular line.
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A statement that two numbers or expressions are equal is a(n)
A statement that two numbers or expressions are equal is an equation.
What is an equation?An equation is a mathematical expression that states that two expressions are equal. An equation's solution is the value that, when substituted for the variable, makes the equation true. To accomplish our goal, we employ two equality principles: the addition principle and the multiplication principle.
An equation is the statement that illustrates the variables given. In this case, two or more components are taken into consideration to describe the scenario. It is vital to note that an equation is a mathematical statement which is made up of two expressions that are connected by an equal sign.
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Enrique predicts that he can make additional money from sales of accessories and service for computer products sold by his store. The table at the right shows predicted percent returns for such sales. For example, if the store makes x dollars selling computer products, Enrique predicts the store with make 0.05x dollars from selling accessories. Part A In January and February of this year, the store made $2,500 from sales of accesories and services. Let x represent the amount the store with make from sales of computer products from March through December. Write an equation that represents the predicted amount y that the store will make from sales of accessories and services for the entire year. If Enrique predicts sales from accessories and services for the entire year will be $5,000, about how much money must be made from computer product sales from March through December? Explain.
The equation that represents the predicted amount y that the store will make from sales of accessories and services for the entire year is (y = 0.05x + 2500).
Given that:
Enrique predicts that he can make additional money from sales of accessories and services for computer products sold by his store.
The store makes x dollars selling computer products, Enrique predicts the store will make 0.05x dollars ($0.05) from selling accessories.
The following steps can be used in order to determine the equation that represents the predicted amount y:
Step 1 - According to the given data, the store makes x dollars selling computer products.
Step 2 - It is also given that, in January and February of this year, the store made $2,500 from sales of accessories and services.
Step 3 - So, the linear equation that represents the given situation is:
y = 0.05x + 2500
Hence the answer is The equation that represents the predicted amount y that the store will make from sales of accessories and services for the entire year is (y = 0.05x + 2500).
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Round 41.86632 off each number
to two (2) Decimal Place
Answer:
2 d.p = 41.87
Step-by-step explanation:
41.86/632
check whether its below or above 5 then round it to the nearest number
2 d.p = 41.87
Answer: 41.87
Step-by-step explanation:
41.86632 to 2 dp is 41.87
The owner of a small store buys coats for $40.00 each. Answer parts a and b. a. She sells the coats for $72.00 each. What percent of the purchase price is the sale price? The sale price is 180% of the purchase price. b. The owner increases the sale price by the same percent that you found in part a when she buys jackets for $25 and sells them. How many jackets must the owner buy for the total jacket sales to be at least $260? Explain your answer. The owner must buy how many jackets?
The percent of the purchase price that the sales price is 80%.
The number of jackets that should sold so that total sales can be at least $260 is 6.
What is the percent of sales price and the number of jackets to be sold?The equation that can be used to determine the percent of the purchase price the sales price is:
Percent = (sale price / purchase price) - 1
($72 / $40) - 1 = 0.80 = 80%
The sales price of the $25 jackets if prices are increased by 80%
Sales price = (1 + percent) x purchase price
(1 + 0.8) x $25
1.8 x $25 = $45
The number of jackets to sell so that total jacket sales can be at least $260 is:
(sales price per jacket x number of jackets) ≥ $260
($45 x j) ≥ $260
$45j ≥ $260
j ≥ $260 / $45
j ≥ 5.8 ≈ 6
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a marine biologist wants to estimate the mean size of the barnacle semibalanus balnoides on a stretch of rocky shoreline. to do so, he randomly selected twenty 10 by 10 square inch plots and measured the size of every barnacle in each selected plot. this is an example of
Option B is the correct choice
A marine biologist measured the size of each barnacle in twenty 10 by 10 square inch areas that were chosen at random. Cluster sampling is illustrated by this.
For a study that is a population into clusters, such as districts or schools, researchers will divide the population into multiple groups (clusters) and will then randomly select some of these clusters as your sample. Ideally, each cluster should be a miniature reflection of the population as a whole.
In order to determine the average size of the barnacles Semibalanus balconies along a section of rocky shoreline, a marine biologist is conducting this study. To do this, he measured the size of every barnacle in each of the twenty 10 by 10 square inch plots that were randomly chosen. Cluster sampling is illustrated by this. (Option B)
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COMPLETE QUESTION:
A marine biologist wants to estimate the mean size of the barnacle Semibalanus balconies on a stretch of rocky shoreline. To do so, he randomly selected twenty 10 by 10 square inch plots and measured the size of every barnacle in each selected plot. This is an example of
a. convenience sampling.
b. cluster sampling.
c. stratified random sampling.
d. simple random sampling.
e. voluntary sampling.
Write another number puzzle with at least three steps. On a different piece of paper, write
a solution to your puzzle.
Puzzle:
A man walked certain distance first. Then, walked 12 miles. Again walked twice the distance he walked at first. Now, the total distance is 42 miles. what is the initial distance?
The initial distance is 10 miles
What is the solution to an equation?
In order to make the equation's equality true, the unknown variables must be given values as a solution. In other words, the definition of a solution is a value or set of values (one for each unknown) that, when used as a replacement for the unknowns, transforms the equation into equality.
Puzzle:
A man walked certain distance first. Then, walked 12 miles. Again walked twice the distance he walked at first. Now, the total distance is 42 miles. what is the initial distance?
Let x= initial distance
x+12+2(x)=42
3x+12=42
3x=42-12=30
x=30/3=10 miles
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