Julie has 3 boxes of pens. The diagram shows expressions for the number of pens in each box.
Look at these equations,
a = b + 9
b = c-2
Write an equation to show the relationship between a and c.

Three times the sum of a number and seven is negative thirty-six. what is the number?

Tyler reads 2/5 of a book on monday, 1/3 of it on tuesday, 2/9 of it on wednesday, and 3/4 of the remainder on thursday. if he still has 14 pages left to read on friday, how many pages are there in the book?

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?