if paul saves $3.00 every week for twelve weeks and then buys a CD for $15.00 plus 9% tax how much money will he have left?

How do you find principle and simple interest

The total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

Can you me find the slope! (30 points)