The original price of a hat was $20. And its price was marked down to $18 during the holiday. What was the percentage of discount for the hat during the holiday? ___ %

An unknown number of kids and buses are getting assigned. when assigning 4 kids to each bus, there are 2 kids that aren't placed in a bus. when assigning 8 kids to each bus, there are 2 empty buses. how many total kids are there?

Determine which postulate or theorem can be used to prove that lmn =nmo

Find the maximum value of p= 4x + 5y subject to the following constraints :