Which of the following rational functions is graphed below?
a. f(x)= x-5/x-1
b. f(x)= x/x=1
c. f(x)= x+5/x+1
d. f(x)= 1/(x-1)(x-5)

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Does the point (1, sqrt 7) lie on circle shown.

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?