18. At Roasters Café, the cost of 3 cups of coffee and 6 donuts is $15, while the cost of 5 cups of coffee
and a dozen donuts is $28. Use these totals to find
the cost of one cup of coffee and the cost of one
donut.

The gades foundation and hbm corporation are eager to donate generously to their favorite charities. the gades foundation donated $250 in the first month, and each month afterward their cumulative donation total increases by 100$ the hbm corporation donated $64, in the first month, and each month afterward their cumulative donation total increases by 75%. in which month will the hbm corporation's cumulative donation total first exceed the gades foundations' cumulative donation total?

The variable in a relation who’s value depends on the value of the independent variable is called what?

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?