Answer:
y^4
Explanation:
2y^10, 5y^4, 6y^5
We first need to find the factors of each term
2y^10 = 2*yyyyyyyyyy
5y^4 = 5yyyy
6y^5 = 3*2 yyyyy
The greatest common factor is the largest term that appears in all the terms
The greatest common factor is yyyy = y^4