The variable z varies jointly with x and y. also z=-75 when x=3 and y=-5

What equation describes this variation?

z =  kxy

What is the constant of variation?

k = 5

When x = 1 and y = –2, z =

-10

Yw.

20%

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.