2+ -8 it's the same as 2-8, the last one it's correct
This question can be solved by:

Cross multiply to get: 8.3x = 3,560,000
To let the x stand along (since you are finding the x value), divide 8.3 to both sides of the equal sign.

Simplify to get the answer.
Answer:
3
Step-by-step explanation:
8 times -5 = -40
<span>y=<span><span>x−5</span><span>−−−−</span>√3
</span></span>
<span><span>x=<span><span>y−5</span><span>−−−−</span>√3
</span></span></span>