Arithmetic Sequence Formula For Stadium Seating
A university classroom features stadium-style seating. The first row contains 15 seats, and each subsequent row contains 5 additional seats. Which of the following formulas can be used to determine the number of seats, Sn, in the nth row?
A
n=5n+15
B
Sn=5(n-1)
C
Sn=4(n-1) + 10
D
None of these is correct.
E
Sn=5(n-1) + 15