Hi there!
All you need to do to solve for a is add 1.6 to both sides of the equation.
It will look like this:
a - 1.6 + 1.6 = -3.7 + 1.6
After this you will see that a = -2.1.
Hope this helps!
When in doubt just replace a with -2.1 and see if you still get -3.7. :)
Your answer is 100ft. This is because to find the radius when you already know the diameter you have to divide the diameter by 2.
Roughly 24, but there's possibly like nine more. I got 24 without getting too confused
The answer would be D because you are subtracting a positive 17 from a positive 88
