Rondell's parents barrow 6,300 from the bank for a new car the interest rate is 6%per year. How much simple interest will they pay if they take 2years to repay the loan

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

Which one ? is the answer and how to find this answer

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.