Can a function assign multiple inputs to the same output? explain why or why not

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?