Simplify.
(-3.9) + (6.01) - (-7.423)
-5.513.
2.487.
9.533.

First, since we must follow PEMDAS, we need to do the operation that is first, which is addition. 

-3.9 + 6.01  ← Adding a negative means subtracting, then giving the sign of the bigger number.

So now we solved those and we got this 2.11

Now, we need to subtract and re-write the expression.

2.11 - (-7.423) = 2.11 + 7.423= 9.533

Okso now we have our final answer, and we have the choices above.

The only answer that matches ours is the last one.

Final 9.533

Hope I helped ^_^

If you would like to calculate and simplify (-3.9) + (6.01) - (-7.423), you can do this using the following steps:

(-3.9) + (6.01) - (-7.423) = -3.9 + 6.01 + 7.423 = 9.533

The correct result would be 9.533.

Add up all the sides