Percent of change will always be positive because the change is an absolute value. As we know, absolute value is always a positive value because you don't pay attention to the direction, only the distance is important.
If the -8 is under the square root, then...

OR
If the -8 is not under the square root, then...

Either way, we replace x with -3 and simplify.
For more information, refer to the direct substitution rule for limits.
C.4/11 is the answer to your question
To find out how much he makes per week, take the amount and divide it by the week.
1520/4=380.
He makes 380 per week.