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4 years ago

What is the sum of the n terms of the series 4 + 12 + 36 + 108 + . . . ?

1 answer:

8 0

Sum of n terms of a geometric series is
Sn = a1 (r^n-1)/(r-1)
a1 = 1st term = 4
r = common ratio = 12/4 = 3
so, the sum is
Sn = 4 (3^n-1)/(3-1) = 2(3^n-1)

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Find the missing side in the similar figures below

Lerok [7]

Answer:

a. 28.8

Step-by-step explanation:

Using the theorem of similarity, the following equation can be generated:

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Solve for x

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Divide both sides by 25

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BlackZzzverrR [31]

Answer:

Step-by-step explanation:

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Where

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In the diagram shown, we can clearly see that height is 12, radius is 9. We can simply plug them into the formula and get our exact answer (leaving pi as pi):

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3 years ago

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fredd [130]

Answer:

x = -3 and x = -3/2

Step-by-step explanation:

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Now notice how x^2 and -9 have the same factor (2x+3). That means x^2 and -9 can go together:

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Factor it once more because there's a difference of squares:

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3 years ago

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Paladinen [302]

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3 years ago

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