2) Write a formula for the nth term of each arithmetic sequence. Then use the formula to find a15.?

Question

a. 3, 8, 13, 18
b. a1 = –3 and d = 6

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Answer 1 · 2018-04-14T17:15:05

#a_15=#81

formula for #nth# term is
#a_n= a_1+(n-1)d#

a)
nth term is
#a_n=3+(n-1)5#
[from given series #a=3#, #d=5#]

b)
given #a_1=-3#, #d=6# so

#a_n= -3+(n-1)6#

#a_15=-3+(15-1)6#

#a_15=-3+84#

#a_15=81#