Which math expression represents the phrase? 9 times the sum of a number and 7
A9 · n+7
B9 · (n+7)
C9 · (n – 7)
D9 · (n · 7)
A9 · n+7
B9 · (n+7)
C9 · (n – 7)
D9 · (n · 7)