PLEASE HELP WITH APEX QUESTION if f(x)= x/2 -2 and g(x) = 2x^2+x-3, find (f+g)(x)

A. x^2-6

B. 2x^2 + 3/2x +1

C. 2x^2 + 3/2x - 5

D. 2x^2 - x/2 + 1

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.