Look for a pattern in the first three equations. Then, fill in the missing numbers in the rest of the series of equations. 1= 1 · 2⁄2
1 + 2 = 2 · 3⁄2
1 + 2 + 3 = 3 · 4⁄2
1 + 2 + 3 + ? = ? · ?⁄?
1 + 2 + 3 + ? + ? = ? · ?⁄?

Solve the following equations.
a. 11w = 88
b. 7u = 210
c. v ÷ 81 = 9
d. c ÷ 4 = 16
For the following problems, tell what operation(s) you need to use. Then, write and solve an equation for each problem.

Bill bought a computer and a printer for a total of $650. The computer cost $525. How much did he pay for the printer alone? (Let p stand for the cost of the printer.)
Bonnie loves to order products online. She ordered 27 products from one company, but unfortunately, some items were back-ordered, so she received only 19 items. How many items were missing from her order? (Let m stand for the number of missing items.)
Terri bought four lipsticks for a total cost of $20. Assuming each lipstick cost the same amount, how much did one lipstick cost? (Let l stand for the cost of one lipstick.)
Brian is conducting surveys for a research paper. Each survey takes him about 10 minutes to complete, so he can get 6 done per hour. At this rate, how many hours will it take Brian to complete 30 surveys? (Let h stand for the number of hours.)
Andy played golf three times during his vacation. His scores were 92, 87, and 88. What was his average golf score during his vacation? (Let A stand for the average.)
Tickets to a local basketball team’s games cost $12 each. Brendon and Ed each bought tickets to four games. How much did they spend on tickets altogether? (Let t stand for the amount spent on tickets.)