Will mark brainiest

2.) find the sum and choose the correct answer.

2n^3 + 4n^2 - 7 and -n^3 + 8n - 9

a.) -n^3 - 4n^2 - 8n - 16
b.) n^3 + 4n^2 + 8n - 16
c.) n^3 + 4n^2 + 8n + 16
d.) 3n^3 + 4n^2 + 8n - 2

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Simplify (4x^2 - 8xy + 2y^2) - (9x^2 - 4xy - 7y^2) a. -5x^2 + 4xy + 9y^2 b. -5x^2 - 4xy + 9y^2 c. -5x^2 + 12xy + 4y^2 d. -5x^2 - 4xy - 5y^2