There are two couches against a wall. if one takes up 4/9 of the wall and the other takes up 1/5 of the wall, how much of the wall is covered by couches?

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.