Makahanap ng eksaktong solusyon sa iyong mga problema sa IDNStudy.com. Ang aming komunidad ay handang magbigay ng malalim at praktikal na mga solusyon sa lahat ng iyong mga katanungan.

In the arithmetic sequence -7, -4, -1, 2, ... , what term is 44 ?

Sagot :

We have -7 as the 1st term, we have 3 as the common difference so:
[tex]n= \frac{a_n-a_1}{d} +1= \frac{44+7}{3} +1 =\frac{51}{3} +1=18[/tex]
The formula for the arithmetic sequence is:
[tex]a_n=a_1+d(n-1)[/tex]

To find the common difference:
-7, -4
The common difference is 3, so:

To find what term is 44:
[tex]44=-7+(n-1)3[/tex]
Add 7 to both sides
51=3(n-1)
Distribute
51=3n-3
Add both sides by 3
3n=54
Divide both sides by 3
n=18

Therefore, 44 is the 18th term. Hope this helps =)