Suppose carpet for a 6 ft by 14 ft room costs $400. find the cost to carpet a room 18 ft by 42 ft.

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

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