1) -15
2) 5
3) -13
4) -4
5) 5
6) 14
7) 0
8) -8
9) -8
10) 7
These are very easy, when subtracting a negative from a positive think of it as just plain subtraction. When adding a negative to a positive, again, think of it as subtraction. When subtracting two negatives it's basically addition but you final answer should have a negative sign.
Hope I could help! :)
E is irrational as well as CV52
The equation in standard form would be,

All you have to do is move -2/7x to the other side.
Hope this helped
:D
D.36 60 .... because 6 times 6 is 36 and 6 times 10 is 60