John buys some boxes of pencils and some packets of pens for people to use at a conference.
there are 40 pencils in a box.
there are 15 pens in a packet.
john gives one pencil and one pen for each person at a conference.
he has no pencils or pens left.
how many boxes of pencils and how many packets of pens did john buy?

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.

answer: entity is prob the answer

step-by-step explanation:

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.