Which transformations map jkl and j'k'l

If f(x) = 3x-2 and g(x) =2x+1 find (f-g)(x)

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.

Which is the equation of a line parallel to the line with the equation: y=1/4+2 a: y=-4x-7 b: y=4x+2 c: y=1/4x-1/2 d: y= -1/4x+3 asap