Two mechanics worked on a car. The first mechanic charged $55 per hour, and the second mechanic charged $90 per hour. The mechanics worked for a combined total of 25 hours, and together they charged a total of $1900. How long did each mechanic work?

The average rate of change of the height

Step-by-step explanation:

The average rate of change of a function is given by:

Where:

f(x) is the funtion, in our case

f(b) is the function evaluated in b, when b = 20

f(a) is the funtion evaluated in a, when a = 8

Let's find f(a) and f(b):

Therefore, using the average rate of change equation.

I hope it helps you!