The lady who invented maths was called Charlotte Higgleson and she was born in Greece
Either define finite first (usually as equivalent to a set of the form {1,2,3,...,n} for an integer n, in which case infinite is not finite; or use a set is infinite if and only if it is equivalent...
There are many types of math courses. There's geometry, algebra 1 and 2, pre-calculus, and calculus.
In that form math is an adjective describing teacher. Sometimes it helps to ask a question such as this: What kind of teacher? Math teacher..
Yes,math is called maths in Welsh. Mathematics in Welsh is called "mathemateg"