What is the constant in the expression 9x +5y + 12

Identify which functions are linear or non-linear. a. f(x) = x2 + 1 b. f(x) = 2x + 5 c. f(x) = x 2 + 3 d. f(x) = 3 x + 7 e. f(x) = 4x + 10 2 - 5

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?