math terms to hard can't find out what they mean?

Question

what is to
perform all indicated operations?

A rate in wich the second quanity in the comparison is one unit?

An eqaution that contains absolute-value expressions?

An equation that contains two or more varaibles?

Answer 1

Operations are +, - ,multiply, divide, exponentiate, squareroot, etc.

Don't know. Need better definition. x miles per y hours and y =1, then x miles per hour

An equation such as |x-7| = 12 which means x-7 could equal either 12 or -12 so x could be 19 or -5.

F(x,y) = x^2+y^2 -r^2. X and ya are both variables