A plus with a minus under it means "plus or minus" in math.
difference means an answer to a subraction problem.
principal(in terms of math)- the amount you borrow or deposit
HL in math mean hypotenuse leg
ask your math teacher
It
sum means the answer of a math problem
In math it is the answer of the biggest of the numbers minus the smallest of the numbers. :) ;)
No.
neither
A rhombus.
Milimeters