10. jenna flips two pennies 105 times. how
many times can she expect both coins to
come up heads?

26

Step-by-step explanation:

When you flip two coins, you can have 4 different outcomes:

HH

HT

TH

TT

All outcomes are equally likely, but notice that if you do not keep track of which coin is which, you will get 1/4 of the flips to be both heads, 1/4 of the flips to be both tails, and 1/2 of the flips to be one heads and one tails.

p(both heads) = 1/4

With 105 flips, the expected number of both heads is

105 * 1/4 = 26.25

26

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.

no

step-by-step explanation:

answer