What are the answers to these five questions because they're confusing and I never learn about Game Theory at all.

Solve this system of equations using the elimination method?

Firms use marginal analysis to determine prices by a) changing prices in accordance with information from retailers. b) using comparisons with strong competitors to position prices accordingly. c) examining the effect on revenue of small changes to the price of one item. d) trying to minimize production costs by using better and more efficient methods.

An object accelarates from rest to a velocity of 2.4m/s over a distance of 16m what was its accelaration