a) What year would be represented by x = 2? 2002 x 1 = 2003 so it would be 3x2=6
b) How much did it cost per gallon of gasoline in the year represented by x=2?
.99
First of all, online we use "*" to indicate multiplication, so it doesn't get confused with "x" as an unknown.
Second, more data is needed to answer your questions.