Find a numerical value of one trigonometric function if

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details

Given: m zade = 60° and m2cdf = (3x + 15) prove: x = 15