Eric's notebook has 30 pages. he wants to writes a number on each page. how many digits will he write when he numbers all the pages in the notebook?
a. 9
b. 29
c. 49
d. 51

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.