Prove that ΔABC ~ ΔDEF

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.

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

What is the midpoint of np if n (1,9) and p (-5-1)