Does this function have a minimum or a maximum, if so what are they? if not, why not? you

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2

The sum of two numbers is 17 and their different is 5. find one' answers

If two samples a and b had the same mean and standard deviation, but sample a had a larger sample size, which sample would have the wider 95% confidence interval? a. sample a as it comes first b. sample b as its sample is more dispersed c. sample a as it has the larger sample d. sample b as it has the smaller sample