3 to the negative second power is written like this:

.
When simplifying an expression with a negative exponent, you take a positive version of the exponent, in this case that would be 2, and apply that to the base.
After doing that, we have 9.
The next step is to put one over that number.
In this case, now after doing that the answer is

.
Hope this helps!
15% it’s running
That’s all I’m aware of
Multiply 120 times .7 because you just Turn the percent into a decimal
Line Q??? You don't really have an image of it