Kendra has $ 7.80 $7.80 in dimes and quarters. if she has 2 2 times as many quarters as dimes, how many of each coin does she have?

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.