Kayla needs a new stroller for her toddler. The baby products store has one in stock that Kayla likes for $400. Kayla will pay six percent in sales tax. The store is running a clearance event on strollers and car seats with discounts of five percent off
Determine the final cost.

25% is the answer

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.

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