What is f(g(13))? 16 26 32 The function is undefined. i know the answer but I dont quite know jow to do it pls help explain

Plz me i need i will give a brain

Tyler enjoys the fish so much that after his birthday his family decides to take him to a famous aquarium a tank at the aquarium is similar to his tank with the scale factor of 8 how many times greater is the volume of the tank at the aquarium than the volume of tyler tank

Bring the fraction a/a-4 to a denominator of 16-a^2