-13 =\dfrac r9+8−13=
9
r
​
+8

1. what is the measure of ∠abc? what is the measure of ∠abd?

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.

Could someone with number 1 and 2