Select each expression that is equivalent to 3(n+6) . select all that apply.
a. 3n+6
b. 3n+18
c. 2n+2+n+4
d. 2(n+6)+(n+6)
e. 2(n+6)+n

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.