8 because it goes from 1s 10s 100s so 8 is the answer
9 servings, 5×3=15 but for each 5 equals 3 so,3 +3+3 =9 because 5 is a serving
Answer:

Step-by-step explanation:
The given functions are:

and

We want to to find

Note that:

We substitute the functions to obtain:

We now substitute x=7, to get:

This implies that

