Could you answer number 6 in the pic​

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Combine like terms to make a simpler expression 3z+z

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.