Answer:
15
Explanation:
The order of operations is the key to solving this problem.
The PEMDAS acronym stands for:
Parenthesis
Exponents
Multiply
Divide
Add
Subtract
10+(28-8)÷4
First, solve parenthesis.


Rewrite the problem down.

Then, divide.
20/4=5
Rewrite the problem down.
10+5
Add.

So, the correct answer is 15.
I hope this helps you! Please let me know if my answer is incorrect.