Can't remember how to solve a certain equation. number 10!

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a seven or king. (b) compute the probability of randomly selecting a seven or king or jack. (c) compute the probability of randomly selecting a queen or spade.

What is 10+10+20 about the origin the square root of a triangle.