What's the property for 85 + 0 = 85

Can someone check my answer? you : )

Write two subtraction equations that are equivalent to 5 + 12 = 17.

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.