5 left! Help please! So close to being done! a. 75. b. 66 c. 122 d. 98. thank you

Find the smallest number by which the given number should be divided to make a perfect cube(with steps or the answer will get reported) a.108 b.2187

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

Write the factored form of this trinomial 9x^2+18x-7