What is true about SUPPLEMENTARY angles?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Zoey made 5 1/2 cups of trail mix for a camping trip. she wants to divide the trail mix into 3/4 cup servings. a. ten people are going on the trip. can zoey make enough 3/4 cup servings so that each person gets one serving? b. what size would the servings need to be for everyone to have a serving?

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.