Help!! Solve Systems by Graphing! (its not a specific question but i dont know how to do it!!!)

how do you find the number of solutions?

Find the missing factor. 7s2 + 25s + 12 = (s + 3)( ).

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

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.