Answer:
7Y + 10
Explanation:
When simplifying expressions, it is important to add like variables with each other, and numbers with numbers. It is like the expression "you can't add apples and oranges", meaning you cannot add two different things.
So in order to simplify this expression we need to add all the Ys:
3Y + 4Y
= 7Y
and the numbers
7 + 3
= 10
Then adding them together gives the simplified version of:
7Y +10