To solve, set an equation:
First Number: x
Second Number: 2x
x+2x=36
3x=36
divide both sides by 3
x=13
First Number: (x) 12
Second Number: (2x) 24
Answers: 12 and 24
The 'i' should go in front of the square root, not inside it.
So the answer should be 
--------------
The way they wrote the expression 
is bit misleading as it might imply that the 'i' is under the square root. However the square root ends after the "5". It might be better to say 
so there is clearer separation. But sticking the "i" in front is also a valid option.
side note: the plus minus part is already handled so there's no need to worry about that.
Answer:
317 degrees
Step-by-step explanation:
Abby practiced for 55 minutes (60 minutes/12 and *11), Lauren practiced for 40 minutes (60/3 and *2)
