For one child, a childcare facility charges $350 per month for preschool and $5.00 per hour for each additional hour for after-school care. The function below can be used to determine f(h), the monthly fee for after-school care and preschool, where h represents the number of hours spent in after-school care. f(h) = 350 + 5h If the total monthly bill for one child was $750, what was the total number of hours the child spent in after-school care? A. 100 B. 90 C. 88 D. 80

D. 80

Step-by-step explanation:

We have the following function  :

(I)

Where is the monthly fee for after - school care and preschool.

Where represents the number of hours spent in after - school care.

We know that the total monthly bill for one child was $750 ⇒

Using (I) we will find the value of the hours '''' that verifies the expression ⇒

⇒

We find that the value of the hours '''' is 80 hours.

The total number of hours the child spent in after - school care is D. 80

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.