I need help ASAP! Adding and Subtracting Radical Expressions!!!

Question

anonymous · Answer

Think about a kayaking race, a round trip airplane flight, a shopper on an escalator, or a swimming competition.

Choose an activity where a rational expression can represent the total or difference of time. For example, what is the time to go round trip on a hot air balloon ride? 

Use full sentences to describe the real world situation. Write the addition or subtraction rational expression to represent your situation. Simplify the expression, showing all the work or explaining the steps using complete sentences

anonymous · Answer

I don't know how to do this one :/

compassionate · Answer

A car with 27 inch wheels is traveling at 75 MPH. How many revolutions per minute are the wheels turning?

(Miles per hour)(inches per foot)(feet per mile) divided by 
(minutes per hour)(circumference of wheel) 

75(12)(5280)/60(27pi) = RPM

anonymous · Answer

Thank you so much! I understand now!!!