The volume of a rectangular cardboard box is modeled by the functions v(x)=(18-2x)(3-2x)x where x is the width

When only separate discreet points are graphed it is called?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

X+y=-4 x-y=2 use elimination with adding and subtraction