You want to use a 99% confidence interval and want your error bound of the proportion to be less than 2%. How many people should you survey

Ineed in figuring out this problem.

Aparking garage charges $1.12 for the first hour and 0.50 for each additional hour. what is the maximum length of time tom can park in the garage if we wishes to play no more than $5.62

Let x = a + bi and y = c + di and z = f + gi. which statements are true?