Just for fun ascend math question

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

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)