Can someone answer these 2 questions for me ?​

Xto the second power plus 14x plus 48. what are the factors? we are doing factoring trinomials with a=1

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

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.