What is the answer to this question? What is the volume of this sphere?

Use ​ ≈ 3.14 and round your answer to the nearest hundredth.

Radius = 8 mm

What are the sotions to the quadratic equation 9x^2=4

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)