Gabe is mapping out important family events. He uses negative numbers to represent time before he was born and positive numbers to represent time after he was born. For example, Gabe's mom was given a special coin in year -20minus, and Gabe's sister was born in year 5. What does year 0 represent?

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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.

Point s has coordinates (4,2). if you rotate s 90 degrees about the origin, (0,0), what are the coordinates of s’?

If -2x²+5-8 is by 4x-9, is of x in ? a) -77 b) -45 c) -32 d) -13