Answer:
Addition
Explanation:
Remember PEMDAS:
P - anything inside a Parenthesis
E - anything that has an Exponent (Squaring)
M - Multiplication
D - Division
A - Addition
S - Subtraction
PEMDAS is the order of operations.
Based on your choices, I would go with Addition. Addition and Summation sound like the same thing however, so I would double check with your teacher.