Last year, the city library collected 117 used books for its shelves. this year, it collected 3 times as many books. how many books did it collect this year?

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.