13. if you are randomly sampling one at a time with replacement
from a bag that contains eight blue marbles, seven red marbles,
and five green marbles, what is the probability of obtaining
a. a blue marble in one draw from the bag?
b. three blue marbles in three draws from the bag?
c. a red, a green, and a blue marble in that order in three draws from the bag?
d. at least two red marbles in three draws from the bag?

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step-by-step explanation:

yes

step-by-step explanation:

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second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.