7 3/8 please give me the answer

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!

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

What is the frequency of the sinusoidal graph?