In the figure alongside, if x - y = 40° then find the values of x and y.

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

One positive number is 9 more than twice another. if their product is 95, find the numbers