a cylindrical can needs to have a volume of 6 cubic inches a label is to go around the side of the can. The function S(r)=12/r gives the area of the label in square inches where r is the radius of the can in inches

1255/4 = 313.75

so each side is 313.75 sq. yards each since its a square

both the domain and range of this function are all real numbers.

the two things that typically limit a domain are dividing by zero and taking the square root of a negative. since this function does not have a square root or a denominator, then you must be able to use all real numbers.