Solve. - 9.8 + (-5.9) + u=-12.4

u=?

A: 3.3

B:-8.5

C:-28.1

D:15.7

The answer is A, 3.3. You first want to distribute the + symbol to the 5.9, which will make it still a negative. From then you want to combine like terms so you can add - 9.8+-5.9. That should be equal to - 15.7. Your equation now is looking like - 15.7+u=-12.4. You want to leave the u alone so now you have to do the opposite of - 15.7 which is add 15.7. What you do to one side, you do to the other. Now add 15.7 to - 12.4. That should be 3.3. Now it looks like u=3.3 which is your answer.

The best way to solve this is to simply substitute all given answers for u.

The answer is A) 3.3