The science department buys microscopes every 5 years, safety goggles every 4 years, and test tubes every 2 years. they bought all three items this year. in how many years will they have to buy all three items again.

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists