Hello,
can anyone me solve the last three questions? the document below is a copy of my brother's homework. questions (b.) and (c.) go along with question ( question (4) is unrelated. i would love to give him a step by step explanation for each question. i will give the "brainliest" to whoever provides the most thorough work.

How do you find the circumfrance of a circle?

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

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost