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3 years ago

Use the formula to evaluate the series 3-9+27-81+...-ae

Mathematics

1 answer:

Anastasy [175]3 years ago

7 0

Answer:

( -4920)

Step-by-step explanation:

we see that the first term is 3 and the common ratio between the succeeding terms is -3. so to solve for the sum of the first 8 terms

Sum = (a1)(1 – r^n) / (1 – r)

and substituting the known terms,we got

Sum = (3)(1 – (-3)^8)/(1 - (-3)) = -4920

Then the answer = ( -4920)

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Mashcka [7]

Answer:

Algebra book weighs 24 oz

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Step-by-step explanation:

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3 years ago

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3 years ago

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Step-by-step explanation:

let the number be x , then :

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combining the two , we have

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4 years ago

PLS HELP!!!!What are the sine, cosine and tangent ratios of<br>angle W in the triangle below

Ksju [112]

Step-by-step explanation:

Remember SOH-CAH-TOA:

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Cosine = Adjacent / Hypotenuse

Tangent = Opposite / Adjacent

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Therefore:

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