The standard tip in a restaurant is 15% of the bill before tax. many people in california find the tip by doubling the sales tax, which is 8.25%. by how many cents does this exceed the standard tip on a bill of 60% before tax?

Do not comment if you aren’t going to . create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.