" · " - product
" - " - difference
13 · (8 - (-10)) = 13 · (8 + 10) = 13 · 18 = 234
Yes your correct but thats not a question
Since all the inside angles are 60, in order to add up to 180, the outside angles need to be 120.
so let's say the sale price is "P", so Nicole would want to know how much will it be P discounted by 18% of P.
Well, the sale price will just be P or 100% of P, minus 18%, the discounted price will be 100% - 18% = 82%, so the discounted price will be 82% of P.

No but give me like 5 minutes and I can try to explain