The cost of holding a party at a rollerskating rink is a function of n, the number of people in the party. The cost function, C , can be represented with this set of rules: C(n)=⎧⎩⎨150,260,400,0
The cost of a party with 9 people is $
.

The cost of a party with 20 people is $
.

a negative exponent is translated as follows:

so, we have

a - base

b - exponent

so,

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.