What is the first step in solving the linear system? Help please

Write 17/20 as a decimal and as a percent.

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.

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take