What is the domain of the function?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

At the county fair, the baxter family bought 6 hot dogs and 4 juice drinks for $12.90. the farley family bought 3 hot dogs and 4 juice drinks for $8.55. find the price of a hot dog and the price of a juice drink.