3 years ago

Help Plz dont understand

2 answers:

7 0

You can use the arithmetic sequence sum formula here:
$n(a_1+ \frac{d(n-1)}{2} )$
Where d = 4
n = 15
$a_i$ = 4i-1

Then, plug the values in, and you should get 465

Alex3 years ago

4 0

A. 465 should be the correct answer

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