[297÷3 + { 4 × 3 ( 20 – 36 ÷ 5 – 2)}]​

Here is the answer to your problem:

so, converting firstly the mixed fractions to improper fractions and then "adding".

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.