anonymous
  • anonymous
Find an equation for the nth term of the arithmetic sequence. -20, -16, -12, -8, ...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Looks like an arithmetic series.
anonymous
  • anonymous
\[ a_n = a_1 + (n-1)d \]
anonymous
  • anonymous
Like this: an = -20 + 4(n - 1)

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anonymous
  • anonymous
That looks right. Test it with \(n=3\)
anonymous
  • anonymous
We know \(n=3 \implies a_n=-12\)
anonymous
  • anonymous
don't you mean -16 /
anonymous
  • anonymous
No, \(-12\) is the third number in the series.
anonymous
  • anonymous
Okay, you're right. Do mind helping me with one more question?
anonymous
  • anonymous
If I have time.
anonymous
  • anonymous
A certain species of tree grows an average of 0.5 cm per week. Write an equation for the sequence that represents the weekly height of this tree in centimeters if the measurements begin when the tree is 800 centimeters tall
anonymous
  • anonymous
In this case \(a_1 = 800\) and \(d = 0.5\)
anonymous
  • anonymous
I know that's the formula, but for this it's quite difficult for me to input it.

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