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3 years ago

Amber earns $150 a week plus $10 for each tree she sells.

Mathematics

1 answer:

Charra [1.4K]3 years ago

3 0

Answer:

Step-by-step explanation:

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A city planner wants to estimate, with a 99% confidence level, the average monthly residential water usage in the city. Based on

torisob [31]

Answer: 82

Step-by-step explanation:

The formula to find the sample size is given by :-

$n= (\dfrac{z^*\cdot \sigma}{E})^2$

, where E = Margin of error.

$\sigma$ = Population standard deviation for the prior study.

As per given , we have

$\sigma=387.40$ gallons.

Margin of error : E= 110 gallons

Critical value for 99% confidence level = z* = 2.576

Then, the required sample size : $n= (\dfrac{(2.576)\cdot (387.40)}{110})^2$

$n= (9.07220363636)^2\approx82$ {Rounded to the nearest integer.}

Hence, the minimum sample size = 82

3 0

3 years ago

Which ratio is equivalent to 4:7? *

sweet [91]

Correct Answer : B

Explanation 4:7 | 4*4 = 16 | 7*4 = 28

7 0

3 years ago

Read 2 more answers

The matrix below represents a system of equations.

noname [10]

Answer:

The first choice: $a = 1$ , $b = -1$ , and $c = 2$ .

Step-by-step explanation:

$\left[ \begin{array}{ccc|c} 2 & -1 & 1 & 5 \cr 1 & 1 & -1 & -2 \cr 1 & 0 & -3 & -5\end{array} \right]$ .

Add the first row to the second row to obtain:

$\left[ \begin{array}{ccc|c} 2 & -1 & 1 & 5 \cr 2 + 1 & (-1) + 1 & 1 + (-1) & 5 + (-2) \cr 1 & 0 & - 3& -5\end{array} \right]$ .

Simplify that matrix to obtain:

$\left[ \begin{array}{ccc|c} 2 & -1 & 1 & 5 \cr 3 & 0 & 0 & 3\cr 1 & 0 & -3 & -5\end{array} \right]$ .

Divide the second row by $3$ :

$\left[ \begin{array}{ccc|c} 2 & -1 & 1 & 5 \cr 1 & 0 & 0 & 1\cr 1 & 0 & -3& -5\end{array} \right]$ .

Hence, $a = 1$ .

Subtract the current row two from row three:

$\left[ \begin{array}{ccc|c} 2 & -1 & 1 & 5 \cr 1 & 0 & 0 & 1\cr 1 - 1 & 0 & -3 & (-5)- 1 \end{array} \right]$ .

Simplify that matrix to obtain:

$\left[ \begin{array}{ccc|c} 2 & -1 & 1 & 5 \cr 1 & 0 & 0 & 1\cr 0 & 0 & -3 & -6 \end{array} \right]$ .

Invert the signs in the third row and divide it by $3$ to obtain:

$\left[ \begin{array}{ccc|c} 2 & -1 & 1 & 5 \cr 1 & 0 & 0 & 1\cr 0 & 0 & 1 & 2 \end{array} \right]$ .

Hence, $c = 2$ .

Subtract two times the current second row from the first row to obtain:

$\left[ \begin{array}{ccc|c} 2 - (2 \times 1) & -1 & 1 & 5 - 2\times 1\cr 1 & 0 & 0 & 1\cr 0 & 0&1 & 2 \end{array} \right]$ .

That simplifies to

$\left[ \begin{array}{ccc|c} 0 & -1 & 1 & 3\cr 1 & 0 & 0 & 1\cr 0 & 0 & 1& 2\end{array} \right]$ .

Subtract the current third row from the first row to obtain:

$\left[ \begin{array}{ccc|c} 0 & -1 & 1-1 & 3-2\cr 1 & 0 & 0 & 1\cr 0 & 0 & 1& 2\end{array} \right]$ .

That simplifies to

$\left[ \begin{array}{ccc|c} 0 & -1 & 0& 1\cr 1 & 0 & 0 & 1\cr 0 & 0 & 1& 2\end{array} \right]$ .

Invert the signs in the first row to obtain:

$\left[ \begin{array}{ccc|c} 0 & 1 & 0& -1\cr 1& 0 & 0 & 1\cr 0 & 0 & 1& 2\end{array} \right]$ .

Hence, $b = -1$ .

$\left[ \begin{array}{ccc|c}1& 0 & 0 & 1 \cr0 & 1 & 0& -1 \cr 0 & 0 & 1& 2\end{array} \right]$ .

3 0

4 years ago

Determine where the PHD Mathematicians live.

Pavlova-9 [17]

Answer:

the answer to A,B,C

Step-by-step explanation:

all the points are on the graph

all answers

b) slope -1

intercept 1

c)(x+3)(x-1)

intercepts (-3,0),(1,0)

vertex (-1,-4)

6 0

3 years ago

A student is running a 10-kilometer race. He runs 1 kilometer every 4 minutes. Select the function that describes his distance f

user100 [1]

Answer:

I think answer 2

don't try it tho if u don't want to take a risk.

8 0

3 years ago

Read 2 more answers