Use
PEMDAS to solve the problem.
PARENTHESIS
EXPONENTS
MULTIPLICATION
DIVISION
ADDITION
SUBTRACTION
In the problem

, there is only multiplication and addition.
According to
PEMDAS, multiplication comes before addition. So you do that first.

Now you add 4 and 99 to get your answer.

The answer is

.
However, it looks like in your question the 99+1 is separated from the 4. If the question was originally

then we do the parenthesis first. 99 + 1 = 100.

.
So depending on your question,

