Please help with this question

Mathematics

1 answer:

NemiM [27]3 years ago

4 0

Use the equation a^2 + b^2 = c^2.

225 + 1296 = c^2
1596 = c^2
Square root both

39 = c

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Answer: (C) 13,120

Step-by-step explanation:

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Input the values above into the Sum formula:

$S_n=\dfrac{a(1-r^n)}{1-r}\\\\S_8=\dfrac{4(1-3^8)}{1-3}\\\\.\quad=\dfrac{4(1-6561)}{-2}\\\\.\quad=\dfrac{4(-6560)}{-2}\\\\.\quad=-2(-6560)\\\\.\quad=13,120$

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