Identify the volume and surface area of the hemisphere in terms of π. i do not understand! i will mark brainliest if you are

Ineed someone to me answer my question i have to have this done and knocked out

Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.

Tan198=asin164=? how to solve this? ?