How do I factor 2x^3−18x and x ^3+6x^2+8x

With this question substitute t=3 and t=5 to determine if the two expressions are equivalent. 4(t + 3) 4t+12 which statements are true? check all that apply. a. the value of both expressions when t =5 is 32. b. the two expressions are not equivalent. c. the value of both expressions when t=3 is 15. d. the value of both expressions when t=5 is 23. e. the two expressions are equivalent. f. the value of both expressions when t=3 is 24.

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Which one is the correct answer, and why?