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VikaD [51]
3 years ago
9

Probability:

Mathematics
1 answer:
HACTEHA [7]3 years ago
6 0
A: We want to select one person who works out three days a week. Our probability is simply 12/80 ~~ 15%

B: At least 4 days a week means 4 days, 5 days, or 6 days.
Hence, we have: (9 + 20 + 8)/80 = 46%

C: At least once a week.
Let's find out how many DO NOT work out and subtract that from our sample space. This means they must work out at least once a week.

(80 - 15)/80 = 81%
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Which of the following pairs of lines are perpendicular? Select all that apply.
nataly862011 [7]

Answer:

y  = \frac{4}{5} x - 8

y = -\frac{5x}{4} + 3

y  = \frac{2}{3} x - 8

y = \frac{-3}{2}x - 8

Step-by-step explanation:

To know the pairs that are perpendicular lines, we need to understand what makes a line perpendicular to another.

Perpendicular lines generally have slopes;

      m and -\frac{1}{m}

So, any of the pairs with a negative inverse value of slope will be perpendicular.

     y  = \frac{4}{5} x - 8         slope = \frac{4}{5}

     y = -\frac{5x}{4} + 3       slope  = -\frac{5}{4}

We see they are negative inverses

     y  = \frac{2}{3} x - 8         slope  = \frac{2}{3}

     y = \frac{-3}{2}x - 8        slope = -\frac{3}{2}

These are also negative inverses.

4 0
3 years ago
Evaluate each expression if r=12 s= -4 t= -6<br> rs divided by 16
MAXImum [283]

Answer:

-3

Step-by-step explanation:

<em>r</em> = 12

<em>s</em> = -4

<em>t</em> = -6

<u>Equation</u>

<em>rs</em> ÷ 16

12(-4) ÷ 16

-48 ÷ 16

-3

6 0
2 years ago
A company paid $48 for 2 cases of printer paper. each case contained 12 packages of paper. next month the company’s office manag
enyata [817]
Cost would be $4,320.
6 0
3 years ago
A circle with a radius of 5 cm has an area of 25π cm2. Which is the best approximation for the area of one-half of this circle?
kotegsom [21]

Answer:

A

Step-by-step explanation:

π=3.14159...

Full circle are 25π cm² = 25*3.14=78.5 cm²

Half 78.5 cm²/2 = 39.25 cm²

4 0
2 years ago
What is the measure of angle B?​
QveST [7]

Answer:

b = 60

Step-by-step explanation:

The sum of the angles of a triangle are 180

80+40+b = 180

Combine like terms

120+b =180

Subtract 120 from each side

b = 180-120

b = 60

6 0
3 years ago
Read 2 more answers
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