Help me pls i don’t know what the missing exponent is

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Describe what moves you could use to create the transformation of the original image shown at right

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.