What is the missing side length in the triangle?

When only separate discreet points are graphed it is called?

Three times the sum of a number and seven is negative thirty-six. what is the number?

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