PLZ PLEASEE HELP ME Even is it's just 1 question but please!!! (#2 I really need!)

2-digit numbers less than 91 which are 1 less than a multiple of 10

The fraction of defective integrated circuits produced in a photolithography process is being studied. a random sample of 300 circuits is tested, revealing 17 defectives. (a) calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool. round the answers to 4 decimal places. less-than-or-equal-to p less-than-or-equal-to (b) calculate a 95% upper confidence bound on the fraction of defective circuits. round the answer to 4 decimal places. p less-than-or-equal-to

Find the zeros of each function. f(x) = 6x^2 - 7x - 20