Please help me this is very important to my grade

Which of the following graphs represents the function f(x) = 2^x

The following numbers will result in a quotient that is less than 1 when it is divided by ? a.2% e. 1 and 2/3 b. x2 f. 1/5 c. 3/10 g. 7/15 d. 5/9

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.