Remember
√(mn)=(√m)(√n)
and
√-1=i
√-25=(√-1)(√25)=(i)(5)
aswer is +/-5i
Basically, this is saying that 80% of (x) = 2 so you have know what the whole would be. It would be 2.5 because 80% of 2.5 is 2. So because you are subtracting 7 from v to get 2.5, you have to add 2.5 to 7 to get v. V=9.5
-15+7=-8
Adding numbers with different signs makes it subtraction and the answer will have the sign of the bigger number
1.)combine like terms: 12-2x=10x 3-10=-7
10x-7
