To determine the number of rows, we need to divide the total number of people by the number of people in each row. Using the information given, we have:
Number of people in the marching band = 45
Number of people in each row = 5
So the equation that shows the number of rows, denoted by "r", is:
r = 45/5
Simplifying the equation, we get:
r = 9
Therefore, there are 9 rows in the marching band.
The answer is (B) 45 ÷ 5 = 9.