Tim used a lever to lift a heavy box off the ground. His input work was 50 J and the output work was 40 J. What was the mechanical efficiency of the lever? A.90%
B.30%
C.80%
D.10%

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.

Agallon of apple juice cost $7 a pack of eight 4.23oz box of apple juice $2.39 which is a better deal

Hundred and tens tables to make 430 in five different ways