Answer:
4d³
Step-by-step explanation:
the smallest exponent of each term is 3 so we know we will have d³
the prime factorization of 28 is 2²·7
the prime factorization of 32 is 2⁵
the prime factorization of 20 is 2²·5
so the gcf of 28, 32, and 20 is 2² or 4
