5) help is needed for a easy word problem :)

Tina practice piano for 15 hours last month and 45 hours this month use multiplication to write a statement comparing me i was tina practice during the two months use addition to write a statement comparing the hours tina practice during the two months

Is the power produced directly proportional to the wind speed, give reasons for your answer?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?