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**soldier** help would be greatly appreciated.

For the first question,

z is jointly proportional to x and y, z=3 when y is 5 and x is 10. Find z when y is 2 and x is 4.

y is inversely proportional to the square of x, y is 8 when x is 3. Find y when x is 5.

The intensity I of light received from a source varies inversely as the square of the distance d from the source. If the light intensity is a 5 foot-candles at 17 feet, find the intensity at 16 feet.

find the inverse of the function y = 2x(squared) -5

Verify if the functions f = (square root) x-9 and g = x (squared) + 9 are inverses

Given f(x)=2x-1 and g(x) = x(squared) + x + 2

a. find (f-g)(x)

b. find f(g(x))

c. Find g (f(2))