How many red, blues, and greens are there?
red, green, blue, blue, red, green, red, green, blue, red
red, blue, red, red, blue, red, blue, red, green, red

Which expression is equivalent to √ -80?

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.