Answers

2015-06-05T14:11:56+08:00

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
This is the formula for the nth term in an arithmetic sequence:
a_n=a_1+(n-1)d
d is the common difference and n is the number of terms.

This is the formula since an arithmetic sequence looks like this:
a_1,a_1+d,a_1+2d,...a_1+(n-1)d

So:
a_6=a_1+(6-1)10 \\ 62=a_1+50 \\ 12=a_1

Since we have the first term equal to 12 then:
a_{15}=a_1+(15-1)10 \\ a_{15}=12+140=152

0