Let x and y represent the number of miles the minivan and hybrid can be driven, respectively.
4) Then the emission requirement can be written as
1.2x +0.5y ≤ 500
5) see attached
0.45013 in scientific notation is: 4.5013 x 10-1
240 gallons to pints would be 1920 pints
1 gallon = 8 pints
No fine is paid if the DvD is returned by the due date.