Add the quantities the plus sign is between. 3 + 4 = 7
"And" usually refers to the process of addition. It can be another word for "plus."
principal(in terms of math)- the amount you borrow or deposit
HL in math mean hypotenuse leg
ask your math teacher
It
A plus with a minus under it means "plus or minus" in math.
sum means the answer of a math problem
A number? ^^
neither
the average
Dekagrams.
average