anonymous
  • anonymous
What is the sum of the first 28 terms of this arithmetic sequence? 69, 75, 81, 87, 93, 99, … A. 2,436 B. 4,200 C. 4,320 D. 4,368
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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chrisdbest
  • chrisdbest
B
chrisdbest
  • chrisdbest
I actually wrote them all down, sorry.
freckles
  • freckles
\[S_n=\frac{n(a_1+a_n)}{2}\] Sn is the sum of the first n terms a1 is the first term an is the nth term

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freckles
  • freckles
you can find the 28 term by using: \[a_n=a_1+d(n-1) \\ a_{28}=69+d(28-1)\] I will let you say what d is
anonymous
  • anonymous
THANKS

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