a. List the first six terms of the arithmetic sequence and identify the common
difference.
a₁ = 7
an = an-1 + 4
b. Find a15-
c. Find the sum of the first 15 terms in the sequence.

a List the first six terms of the arithmetic sequence and identify the common difference a 7 an an1 4 b Find a15 c Find the sum of the first 15 terms in the se class=