PLZ HELP ASAP The linear function f(x) = 0.9x + 79 represents the average test score in your math class, where x is the number of the test taken. The linear function g(x) represents the average test score in your science class, where x is the number of the test taken.

x g(x)
1 78
2 79
3 80

Part A: Determine the test average for your math class after completing test 2.
Part B: Determine the test average for your science class after completing test 2.
Part C: Which class had a higher average after completing test 4? Show work to support your answer.