During the summer, Gavin tutors and Eva washes cars. To show their earnings, Gavin makes a graph and Eva makes a table. Who earns more money per hour, and by how much more?

Gavin earns more by $8.5

Step-by-step explanation:

Given

See attachment

Required

Who earns more?

For Gavin's

-- slope

For Eva;

The slope is calculated as:

Where:

So:

By comparison:

This means that Gavin earns more

Calculate the difference:

By $8.5

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a