The function f(x) = 3x2 + x + 1 represents the number, in thousands, of wrist bands Lin expects to sell x weeks after opening her shop. What is the average rate of change over the interval 1 ≤ x ≤ 2?
A) 10
B) 5
C) 15
D) -10

since we know that the two functions are equal, f (x) = g

(x), therefore when we equate the two equations the result should be similar to

3x = x – 4:

a. f(x) = 3x, g(x) = x – 4

equating the two functions:

3x = x – 4             (correct)

so we now got our answer (a)

your answer is b.

x = 33.9

y = 65.6

step-by-step explanation: