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Murrr4er [49]
3 years ago
14

Write the explicit formula for the geometric sequence. a1 = -5 a2 = 20 a3 = -80

Mathematics
1 answer:
Anni [7]3 years ago
6 0
a_1 = -5;\ a_2 = 20;\ a_3 = -80 \\\\a_2:a_1=r\ and\ a_3:a_2=r\\\\r=20:(-5)=-4\ check\ r=-80:20=-4\\\\a_n=a_1r^{n-1}\to a_n=-5\cdot(-4)^{n-1}=-5\cdot(-4)^{-1}\cdot(-4)^n\\\\=-5\cdot\left(-\dfrac{1}{4}\right)\cdot(-4)^n=\dfrac{5}{4}\cdot(-4)^n\\\\Answer:\boxed{a_n=-5\cdot(-4)^{n-1}\ other\ a_n=\frac{5}{4}\cdot(-4)^n}
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Parallelograms geometry acellus pls help
Mamont248 [21]

Answer:

x = 60

Step-by-step explanation:

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2x and x are consecutive angles. Therefore:

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Divide both sides by 3

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Answer:

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hope that helped

if yes give me brainliest and if no draw my attention by hitting the comment section

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Natali5045456 [20]

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Step-by-step explanation:

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3 years ago
Explain how circle C with center at (−9, 8) and radius 7 is similar to circle D with center at (−1, −1) and radius 5.
Korolek [52]

Answer:

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We are told that circle D has center (6, -2) and a radius of 4.

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Let's look at our circles. Circle C has a radius of 2 and is inside circle D, whose radius is 4. Between Circle C and Circle D, the radii have a 1:2 ratio, as seen below:

If we dilate circle C by a factor of 2, it means we are expanding it and doubling it. Our circle has that 1:2 ratio, and doubling both sides gives us 2:4. The second step checks out.

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Thus, the argument is correct and the last choice is best.

Cute copy and paste:

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6 0
3 years ago
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