Well, hello there! In math, "purchase" simply means to buy something. It's like when you exchange money for a product or service. Just think of it as bringing a little piece of joy into your life through a special transaction. Happy math-ing, my friend!
It means the same in math as it means else where--it means not reasonable. If you show mathematical steps that are not reasonable to solve a math problem or show a math proof, then your math is unreasonable.
In math it means 2 4 6 8 and not math means equal
In math decrease means minus and increase means plus
intensive math means your one level behind regular math
means ten times