Emilio practices the piano 20 minutes a day. To identify the total number of minutes he practices, he uses the function rule: y = 20x. Find f (8) A. 28 B. 40 C. 80 D. 160

D. 160

Step-by-step explanation:

This question asks us to find f (8). Essentially, this asks us to find out what y is when x is equal to 8. In terms of this problem, how many minutes does he practice after 8 days.

We are given the equation:

y=20x

We want to find f (8). Therefore, we must substitute 8 in for x.

y=20 (8)

Multiply 20 and 8

y=160

Therefore, f (8) is 160 and D is the correct answer. This means that after 8 days, Emilio practices for 160 minutes.