Which of the following functions are one to one? select all that apply. (3 correct answers)

With number 11 ( show how you got the answer)

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.

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.