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anzhelika [568]

3 years ago

9

James is building a doll house that is proportional to his own house. He is using a scale of 0.5 inch = 1 foot. If the doll hous

e is 12.3 inches tall, how tall is his house?

1 answer:

Minchanka [31]3 years ago

3 0

24.6 because 12.3 divided by 0.5 is 24.6

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The sum of first five term of GP is 19607.

Step-by-step explanation:

We are given the following in the question:

A geometric progression with 7 as the first term and 7 as the common ration.

$a, ar, ar^2,...\\a = 7\\r = 7$

$7, 7^2, 7^3, 7^4...$

Sum of n terms in a geometric progression:

$S_n = \displaystyle\frac{a(r^n - 1)}{(r-1)}$

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The sum of first five term of GP is 19607.

Verification:

$2801\times 7 = 19607$

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