Kevin took his car to Dwain's Automotive to have the engine replaced. Kevin was told that at the most, the total bill for parts and labor would be $6,300. The cost of
the parts was $3,900. How much could Kevin expect to pay for labor?

Step-by-step explanation:

$2400 in labor

1 number

if we use a graphing calculator, there is only one such number that satisfies the conclusion of the mean value theorem, that is, a number such that

where the right-hand side is the average rate of change of f on the interval [0.5,0.75], which is the slope of the secant line.

in the attached graph, the black line is the secant line which has its slope as the average rate of change of f on [0.5,0.75], while the orange line is the only tangent line to the graph of f in the interval that satisfies the mvt conclusion.