Eight more than three times a number is 53. find the number

(a) (8%) compute the probability of an even integer among the 100 integers 1! , 2! , 3! , until 100! (here n! is n factorial or n*(n-1)*(n-2) *… 1) (b) (16%) compute the probability of an even integer among the 100 integers: 1, 1+2, 1+2+3, 1+2+3+4, …., 1+2+3+… + 99, and 1+2+3+… + 100

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Astraight water slide is 175 feet above ground and is 200 feet long. what is the angle of depression to the bottom of the slide?