anonymous
  • anonymous
1. Find the sum of the geometric sequence –3, 15, –75, 375, … when there are 8 terms and select the correct answer below. –195,312 195,312 292,968 –292,968
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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freckles
  • freckles
you can add the 8 terms up like it is or you can use a formula if you wish
anonymous
  • anonymous
2. Finn bought a yoyo from a company that claims that, with each retraction, the string rolls up by 80% of the original length. He sets up a tape measure and throws the yoyo 3 times. His data are charted below. Throw Length of string (feet) 1 3 2 2.4 3 1.92 Finn wants to find the sum of the length of string after 10 throws. What is the sum of the lengths, rounded to the nearest hundredth? 13.39 feet 15.00 feet 4.46 feet 0.40 foot 3. Evaluate S5 for 300 + 150 + 75 + … and select the correct answer below. 18.75 93.75 581.25 145.3125
freckles
  • freckles
\[S_n=\frac{a_1(1-r^n)}{1-r} \\ \text{ where} n=8 \text{ since you want to find the sum of the first 8 terms }\]

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anonymous
  • anonymous
@freckles just add the terms that's it?
anonymous
  • anonymous
@freckles or did you mean multiply?
freckles
  • freckles
sum means to add
freckles
  • freckles
you are to find the sum not the product
freckles
  • freckles
you have to find the other 4 terms though if you do it that way
freckles
  • freckles
but I would just use the formula because it is quicker to me
freckles
  • freckles
i must go good luck
anonymous
  • anonymous
@freckles thanks

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