Find the first five terms of the sequence given by a1 = 2, an = -3an-1

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!

Convert 3,200,000 to a scientific notation.

If sina is 4/5 then find the value of sin3a . with explanation.