Which statements are true about the expression 8 (a + 7)? Check all that apply.

1.To simplify, distribute a to 8 and to 7.
2.8(a) can be rewritten as 8a.
3.8 (a + 7) can be rewritten as 8 (a) + 8 (7).
4.8 (a + 7) can be rewritten as 8 (a) + (7).
5.An equivalent expression is 15a.
6.An equivalent expression is 8 a + 7
7.An equivalent expression is 8 a + 56