Find the difference
21.12 – 12.2

Can you guys plz answer this question in order and quickly plz i will give 30 points

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.

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?