Please help me show work

Step-by-step explanation:

15x+26 + 5x+34 =180

20x + 60 =180

20x=120

z + 15(6) +26=180

z=180-26-90=180-116

hope it helps:)

b

step-by-step explanation:

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.