Dion is constructing a picture frame in the shape of a rhombus. The
diagonals measure 20 inches and 32 inches. What is the area he can frame?

A:320in^2
B:52in^2
C:64in^2
D:32in^2

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.