Quadrilateral ABCD is inscribed in a circle. Angle B measures 74 degrees, and angle D measures (x-15) degrees. What does x equal? A-106
B-105
C-91
D-121

pls help asap ​

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.