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3 years ago

10 points - need the answers to questions 7-10 with work.

Mathematics

1 answer:

Verdich [7]3 years ago

8 0

The sum of the interior angle of a pentagon is given by (n-2)180, where n is the number of sides. So:
7)720/180=4=n-2
n=6
8)1260/180=7=n-2
n=9
9)1800/180=10=n-2
n=12
10)4500/180=25=n-2
n=27
☺☺☺☺

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You want to survey seventh-grade students about computer use. Which sample is more likely to be random? You ask seventh-graders

vova2212 [387]

Answer:

You ask seventh-graders leaving the cafeteria after lunch.

Step-by-step explanation:

Try and choose a sample with the student group that has nothing to do with what you're testing for. It will take a bit of "creative" thinking and guessing about the lives of students in each of these groups. We try to choose a good sample to get accurate or less-biased results.

You ask seventh-graders entering a library on Friday night.

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7 0

4 years ago

Find a average daily rainfall for a 30 days month if the total rainfall during that period was 16.8 inches.

max2010maxim [7]

Average = 0.56 inches

Solution:

Given data: Total rainfall = 16.8 inches

Total number of days for a month = 30

To find the average of the rainfall.

Formula for average:

$\text {Average}=\frac{\text {Sum of the observations}}{\text {Total number of observations}}$

$\text {Average}=\frac{16.8}{30}$

= 0.56 inches

Average = 0.56 inches

Hence, average of daily rainfall is 0.56 inches.

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4 years ago

Find the equation of a line that contains the points (3,7) and (-6, 4). Write the equation in slope-intercept form, using

NikAS [45]

Answer:

$y=\frac{1}{3} x+6$

Step-by-step explanation:

$(3,7)(-6,4)$

Step 1. Find the slope (by using the slope-formula)

m = slope

$m=\frac{y_2-y_1}{x_2-x_1}$

$m=\frac{4-7}{-6-3}$

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

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

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

Step 2. Write the equation (using the slope and the points)

Here's how to do it:

Slope-intercept Formula $y=mx+b$ whrere m = slope and b = y-intercept

Plug in the slope into the Slope-intercept Formula

$y=\frac{1}{3} x+b$

Find the y-intercept (b) by using a point and substituting their x and y values

$y=\frac{1}{3} x+b$

Point: (3, 7)

$7=\frac{1}{3} (3)+b$

$7=1+b$

$b=7-1$

$b=6$

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3 years ago

25 is what percent less than 35

mars1129 [50]

Difference between 25 and 35 = 35 -25
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Then
percentage by which 25 is less than 35 =(10/35) * 100
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So 25 is 28.57% less than 35.This is the only clear way of solving these kind of problems. I hope you have understood the method used to solve this problem. Hopefully you can do such type of problems without needing any help.

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4 years ago

Read 2 more answers

Solve 2x - 11 = k for x.

denis23 [38]

2x + -11 = k

Reorder the terms:
-11 + 2x = k

Solving
-11 + 2x = k

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '11' to each side of the equation.
-11 + 11 + 2x = 11 + k

Combine like terms: -11 + 11 = 0
0 + 2x = 11 + k
2x = 11 + k

Divide each side by '2'.
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Simplifying

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