Sarah buys a car originally priced at $25,000 at a discount rate of 1/5 off the original price. How much does Sarah pay for the car after the discount?

20,000 dolllars

Step-by-step explanation:

i think

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.