What is 4X squared times X -4

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

If a=0.333333 and b=0.55555, what is the value of a+b

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.