Match each tax credit to its description

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Scenario: susan wants to make 2 square flags to sell at a crafts fair. the fabric she wants to buy is 3 meters wide. she doesn't want any fabric left over. what's the least amount of fabric she should buy? question: which equation will susan solve her problem? note: let x represent the length of 1 side of the flag. options: 1) 2x^2 = 4x 2) 8 +2x = 2(4x) 3) 2 * 2 = 4 * 2 4) 4x^2 -2x = 0