Question

John played a note on his tuba that vibrated the air 120 times per

second. If he played the note for 4 seconds, how many times did
the air vibrate?

Answer 1

480 times

Explanation:

per second=120

4 seconds=?

120 x 4 = 480

Answer 2

480

Explanation:

12*4=48

put a zero on the end and you get:

480