Find the volume of the triangular prism ASAP

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.