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3 years ago

7

An education researcher randomly selected 48 middle schools from across the country and interviews every teacher of the selected

schools. Which sampling method did he use?

1 answer:

swat323 years ago

8 0

Answer:

graphs

Step-by-step explanation:

the answer is graph

it can be any graphs (pie chart, bar graph)

the question doesn't say about the data collected

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Alice earns simple interest on a principal of $1,400 at an annual interest rate of 6% for the period of 3 years. What equation s

Greeley [361]

The amount of interest is $252. The equations or represent the relation relationship between p, (r), (t) and (i).

Step-by-step explanation:

The formula of simple interest is

Where, principal amount (p), rate of interest (r), period of investment in years (t), and interest earned (i).

The principal amount is $1,400, interest rate of 6% and the time period of 3 years.

The amount of interest is

Therefore the amount of interest is $252.

The equations or represent the relation relationship between p, (r), (t) and (i).

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2 years ago

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The distance around the lake is 0.75 mile.derek ran 0.8 of the distance on monday . how far did he run? the answer is 0.75 * 0.8

Elanso [62]

$0.75*0.8= \frac{75}{100} * \frac{8}{10} = \frac{75*8}{100*10} = \frac{600}{1000} = \frac{6}{10}=0.6$

5 0

3 years ago

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What is the value of /E/ +/F/, A.-9 B.-11 C.11 D.9?

Furkat [3]

Answer:

Step-by-step explanation:

|E| + |F|

|1| + |-10|=11

Answer=11

7 0

3 years ago

Determine which of the lines are parallel and which of the lines are perpendicular. Select all of the statements that are true.

grandymaker [24]

Answer:

Lines a and b are parallel

Lines a and c are perpendicular

Lines d and c are perpendicular

Step-by-step explanation:

we know that

The formula to calculate the slope between two points is equal to

$m=\frac{y2-y1}{x2-x1}$

Part 1) Find the slope of Line a

we have the points

(-3,4) and (3,6)

substitute in the formula

$m=\frac{6-4}{3+3}$

$m=\frac{2}{6}$

simplify

$m_a=\frac{1}{3}$

Part 2) Find the slope of Line b

we have the points

(-10,-3) and (-8,3)

substitute in the formula

$m=\frac{3+3}{-8+10}$

$m=\frac{6}{2}$

$m_b=3$

Part 3) Find the slope of Line c

we have the points

(0,5) and (3,-4)

substitute in the formula

$m=\frac{-4-5}{3-0}$

$m=\frac{-9}{3}$

$m_c=-3$

Part 4) Find the slope of Line d

we have the points

(4,-7) and (13,-4)

substitute in the formula

$m=\frac{-4+7}{13-4}$

$m=\frac{3}{9}$

simplify

$m_d=\frac{1}{3}$

Part 5) Compare the slopes

Remember that

If two lines are parallel then their slopes are the same

If two lines are perpendicular then their slopes are opposite reciprocal

we have

$m_a=\frac{1}{3}$

$m_b=3$

$m_c=-3$

$m_d=\frac{1}{3}$

therefore

Lines a and b are parallel (slopes are equal)

Lines a and c are perpendicular (slopes are opposite reciprocal)

Lines d and c are perpendicular (slopes are opposite reciprocal)

6 0

3 years ago

PLEASE HELP WILL GIVE BRAINLIST PLEASEEEEEEEEEE

Amiraneli [1.4K]

Answer:

I think it would be c 160

Step-by-step explanation:

5 0

3 years ago

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