Which expression is equivalent to the expression shown?

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

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

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?