-5i/2i. is the answer because all you have to do is add the -5 and the i.
$616 because 550 times .12(12% as decminal) is 66. $66 plus $550 is $616
13 is prime because there is only 1 factor 1 and 13.

Above step we use "Multiplication property of equality"

In the above step we "Simplify on both sides of equation"

In the above step we use "Distribution property"

The above step is the result of using "Subtraction property of equality"

Above step is result of "Combining the like terms"

Above step is the result of using "Division property of equality"

Above step is result of "Simplifying fractions on either side of equation"