Question

1. Carol owns Virgil’s Electrical Corporation. She needs an electrician and is placing a nine line classified ad. The cost of an ad that is x lines long is given by the following piecewise function. Find the cost of a nine-line ad. 28 when 3 ( ) 28 4( 3) when 3 x c

Answer 1

Answer:

The cost of 9 line ad is #52

Explanation:

Given

$f(x) = 28$ --- $x \le 3$

$f(x) = 28 + 4(x - 3)$ --- $x > 3$

Required

The cost of a 9 line ad

This means that:

$x = 9$

To calculate the cost, we make use of:

$f(x) = 28 + 4(x - 3)$ --- $x > 3$

Because $9 > 3$

So, we have:

$f(x) = 28 + 4(x - 3)$

$f(9) = 28 + 4 * (9 - 3)$

$f(9) = 28 + 4 * 6$

$f(9) = 28 + 24$

$f(9) = 52$