3 years ago

Find the 8th term in the geometric sequence 5,-15, 45...

Mathematics

1 answer:

Ratling [72]3 years ago

5 0

Answer: 32805

Step-by-step explanation:

The factor between each term is -3, so you have to multiply -3 eight times (-3 to the power of 8), which is 6561. You have to multiply 6561 by 5 to get the answer.

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Step-by-step explanation:

Given

$\begin{array}{cc}{x} & {f} & {0} & {1} & {1} & {2} \ \\ {3} & {1} & {4} & {2} & {5} & {6} & {6} & {7} & {7} & {6} & {8} & {5}\ \end{array}$

Required

Calculate the mean

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$Mean = \frac{\sum fx}{\sum f}$

So, we have:

$Mean = \frac{0*1 + 1*2 + 2*1 + 3*1+4*2+5*6+6*7+7*6+8*5}{1+2+1+1+2+6+7+6+5}$

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