Find the volume of the prism. cubic cm. 15cm 5cm 3cm

Can someone me out here and the tell me the greatest common factor

An isosceles trapezoid with a perimeter of 42 inches. each of the congruent non parallel sides is 5 inches long, and the trapezoid is 3 inches tall. how long are the two parallel sides? a. 10 in, 22 in b. 16 in, 16 in c. 10 in, 16 in d. 12 in, 20 in

If f(x)=3 over x+2 - square root x-3 then f(7)=