We have the fomular:

So try inserting your values and you should get the result.
Answer
He got an 80
Step-by-step explanation:
50 - 10 = 40
40/50 as a whole number is 80
Answer:
Im in middle school, please understand this. Its b.
Step-by-step explanation:
I know because well, I did the equation and rounded up and got that answer.
Answer:
"Evaluation" mostly means "simplifying an expression down to a single numerical value". Sometimes you will be given a numerical expression, where all you have to do is simplify; that is more of an order-of-operations kind of question
example: So let we are given a polynomial function as:
and we are aksed to evaluate this polynomial at 
Then the value of the polynomial will be:

Hence on evaluating the polynomial function f(x) at
we get the value of the polynomial function as
.