#4 - The reason it's 12 is because the -5 is in parenthesis which means they want you to find the absolute value of the number and then add it. The absolute value of a negative number is positive.
#3 really you're adding 5 to -7.
#2 opposite of #3, you can think of it as subtracting 5 from -7.
Find what percent of $39.00 the sale price was. => 15/39*100=38.4% now subtract from 100% to get the mark down percentage. 100-38.4=61.6 Final answer: Marked down 61.6% Hope I helped :)