Please help! Will mark brainliest if correct! Tysm :)

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

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3

The square root of 9x plus 7 plus the square rot of 2x equall to 7