Just don't understand 8 and 9 can you me with it..

then i just need 2,4 and then that is

Astandard american eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. assuming the weights of standard eskimo dogs are normally distributed, what range of weights would 99.7% of the dogs have? approximately 26–34 pounds approximately 24–36 pounds approximately 28–32 pounds approximately 29–31 pounds

With finding limits of multi variable !

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.