Question

The table shows values for a quadratie function

What is the average rate of change for this function for the interval from 1
Please see
Pic

Answer 1

B

Explanation:

The average rate of change of f(x) in the closed interval [ a, b ] is

`(f(b)-f(a))/(b-a)`

Here [ a, b ] = [ 1, 3 ] , then

f(3) = 18 ← value of y when x = 3

f(1) = 2 ← value of y when x = 1

Then

average rate of change =
`(18-2)/(3-1)` =
`(16)/(2)` = 8 → B