Lamar received a gift card of $60 for a pizza restaurant. The restaurant charges $5 per pizza. Salma received a gift card of $100 for a different pizza restaurant. The restaurant charges $10 per pizza.

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.

f(x) is   are being squared

g(x) is   increasing by 2

h(x) is adding .25 each time

k(x) is taking the square root

f(x) and k(x) are exponential functions

i'm guessing it might be 40.