Guest Session: 1 Question Remaining.
Create Account
to save progress.
Login
Arithmetic Sequences
medium
0:00.0
The sum of the first
n
n
n
terms is
S
n
=
2
n
2
+
5
n
S_n = 2n^2 + 5n
S
n
=
2
n
2
+
5
n
. Find
a
1
a_1
a
1
.
A
5
5
5
B
6
6
6
C
7
7
7
D
8
8
8
Submit Answer