What is 33% of 84? (i got the answer but just want to know if im right cause it sometimes gets difficult for me)

What is the missing value in the proportion 4/5 = x/30

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.

Equal rights is what a. equlaity b. standards c. sovereignty d. minority rights