In mathematical logic, two statements, X and Y, are true if and only if both X as well as Y are true. So if either X or Y (or both) are false then "X and Y" is a false statement. Similarly, if some conditions, S and T, need to be satisfied by a variable then S as well as T must be satisfied.
It usually signifies addition.
what does key mean in math
a
Approximately
about
I do not know of such a word related to math(s)
There is no such math word, so it does not mean anything. You may wish to check your spelling before posting questions!
the word by means 'times' or 'multiply'
The word at means the least
its mean like well its a math term its like distrubed fractions
The word "mean" in math means the same thing as average. Mean is just a nickname for average.
it mean per rate
arithemetic mean