what is the rate of change in dollars per hour if plumber charges 130.00 for 2 hrs work and 235.00 for 5 hrs work

$35

Step-by-step explanation:

To get to this conclusion it might help to draw out a table. So we must first subtract $235 for $130 to get the numerator for our rate of change which would be 105. Let's lock that into our numerator spot. Next we would have to subtract the hours from each other. So it would be 5 hours - 2 hours which would equal 3 hours. Now that we have our rate of change fraction all we would have to do is simplify it. So $105 over/divided by 3 hours equals a rate of change of $35.