Where does the Parenthesis go to make the following equation true?

12=60-18÷2+4+10÷2

Given this information, which expression must represent the value of b?

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

The measure of an angle is 117°. what is the measure of a supplementary angle?