The worst choice for energy in the future is:

- Fossil Fuels
- Hydroelectric
- Nuclear Energy

Fossil fuels, our fossil fuels are already limited and we will run out if we continue to use them.

Explanation:

answer; i believe the correct answer is (data); /// good luck

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)