Free pints this is meant for certain ppl

Which of the following tables represents exponential functions?

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?