2) Barbara and Billy each spent the same amount at the store. Barbara knew that her set of colored markers cost $4, but she forgot how much
her 2 equally priced notebooks cost. Billy bought 3 of the same
notebooks and a wristband for $1. How much was each of the
notebooks? How much did each spend?

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/XzW3SUN

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads