3m + 9 - 9m = 2m + 25 whats m

Trigonometry hellllllpppppppp asap

Which of the following is the result of expanding the series

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.