If f(x)=x-3/x, g(x)=x+3, and h(x)==2x+1, what is (g*h*f)(x)?
A) (g*h*f)(x)=3x-6/x
B) (g*h*f)(x)=6x-6/x
C) (g*h*f)(x)=2x+4/2x+7
D) (g*h*f)(x)=8x+1/2x+1

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.