For Number 2, Alana has the prism with the greater volume.
Though they both share the same dimensions, height of 20, length and width of 3 and 4, do NOT forget that for a triangle, you have to divide the result by half, thus making Sam's triangle of less volume.
For Number 1, the answer is no. She only has 750 square inches of wrapping paper while the SA ( surface area/ area of the top of a prism ) comes to 792 inches.