Find his rate:
120 / 15 = $8 per hour
Multiply the rate by hours:
$8 x 20 hours = $160
He will earn $160
Given two points. we can find the equation of a line passing through the points
The formula to be used is:

where


=>

The next step is to cross multiply

=>

Divide both sides by 6 and make x the subject
x=3
Answer: CasioFX-CG50
Step-by-step explanation: you can get it on amazon
<h3>step 1.</h3>
use graph paper.
<h3>step 2.</h3>
draw lines thru the graph wait go on my image above!