Asheet of 20 stamps cost $9.20. what is the cost of each stamp?

To find the cost of one stamp, divide the total cost by the total number of stamps bought:

9.20 / 20 = 0.46

Each stamp cost 46 cents.

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.