Register
Identify the 42nd term of an arithmetic sequence where a1 = -12 and a27 = 66
138k views
1 vote
Identify the 42nd term of an arithmetic sequence where a1 = -12 and a27 = 66

User Donna
by
8.2k points

1 Answer

7 votes
a1 = -12
a2 = a1+d = -12+d
a3 = a2+d = a1+2*d = -12+2*d
.......
a27 = a26+d = a1+26*d = -12+26*d = 66

so: 26*d=66+12
26*d=78
d=78:26
d=3

therefore: a42 = a1+41*d = -12+41*3 = -12+123=111
User Inyoka
by
9.0k points
← Prev Question Next Question →

Related questions

User Tjohnson
asked Jun 24, 2017 199k views
Identify the 42nd term of an arithmetic sequence where a1 = -12 and a27 = 66
Tjohnson asked Jun 24, 2017
by Tjohnson
7.8k points
2 answers
1 vote
199k views
User Goulou
asked Feb 8, 2018 100k views
Identify the 42nd term of an arithmetic sequence where a1 = −12 and a27 = 66
Goulou asked Feb 8, 2018
by Goulou
7.7k points
2 answers
2 votes
100k views
User Sandeep P
asked Apr 28, 2021 172k views
Identify the 42nd term of an arithmetic sequence where a1 = -12 and a27 = 66. (2 points) 70 72 111 114
Sandeep P asked Apr 28, 2021
by Sandeep P
7.8k points
2 answers
3 votes
172k views
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers

Other Questions

How do you can you solve this problem 37 + y = 87; y =
What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Link Copied!