Which math expression represents the phrase? 4 times the sum of a number and 9
A4 · n + 9
B4 · (n · 9)
C4 + (n + 9)
D4 · (n + 9)
A4 · n + 9
B4 · (n · 9)
C4 + (n + 9)
D4 · (n + 9)