Bisceting figuers worksheet

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

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.

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?