Can some one help me with this plzzz

Ben wants to play a carnival game that costs $2. in his pocket he has 5 red tickets worth 35 cents each, and 15 blue tickets worth 10 cents each. which of the following systems of inequalities correctly represents the constraints on the variables in this problem? let represent the red tickets and b represent the blue tickets.

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Find the amplitude of a sinusoidal function that models this temperature variation