The sum of two consecutive numbers is n+1. what are the numbers?

Which of these triangle pairs can be mapped to each other using two reflections?

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.