Combining Functions, addition, subtraction, multiplication, division AND composition[br][br]For video explanation look at [br][url]https://www.khanacademy.org/math/algebra/algebra-functions/eval-function-expressions/v/sum-of-functions[/url][br]and various other videos in that location.[br]or[br][url]http://patrickjmt.com/functions-adding-and-subtracting/[/url] or [url]http://patrickjmt.com/functions-multiplying-and-dividing/[/url] or [url]http://patrickjmt.com/composition-of-functions/[/url]