Need to find equivalent equation, see photo, thanks!

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

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

What is the equation of a line passing through the point (6,1) and parallel to the line whose equation 3x=2y+4