What is 1/5 of and hour

Tamera puts 15/4 gallons of gasoline in her car. which mixed number represents the gallons of gasoline? a) 2 3/4 gallons b) 3 1/4 gallons c) 3 3/4 gallons d) 4 1/2 gallons answer it's worth a lot of points!

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Ineed to know the answer to this algebra question.