Can someone help me please

Strange question. All the answers are D

Explanation:

I don't exactly know how you should answer this. I can find the charge on Chromium. The only hope is that they are all the same.

[Cr(OH)_-6]^-3

x - 6 = -3   Add 6

x = -3 + 6

x = 3

CrO4 ^-2

x - 4*2 = - 2   add 8

x = -2 + 8

x = 6

Water has no effect on the charge. The chromium has a charge of +2

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.