Select all the correct answers.
observe the expression below and select the true statement(s)

3y(7 + 2x) + 9xy - 10

1. the "(7 + 2x)" in the first term is a factor.
2. the "9" in the second term is a coefficient,
3. the "3" in the first term is a factor
4.the "10" in the third term is a coefficient
5. the "2" in the first term is a constant,
6. the "x in the second term is an exponent