2 years ago

What is the sum (2 – 3i) + (-4-2i) ?

Mathematics

1 answer:

zysi [14]2 years ago

5 0

-2-5i is the correct answer

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What is the sum of the first 6 terms of this geometric sequence? –4, –16, –64, –256, …

MatroZZZ [7]

$a_1=-4;\ a_2=-16;\ a_3=-64;\ a_4=-256;\ ...\\\\r=\dfrac{a_{n+1}}{a_n}\to r=\dfrac{a_2}{a_1}\to r=\dfrac{-16}{-4}=4$

The formula of the sum of a geometric sequence:

$S_n=a_1\cdot\dfrac{1-r^n}{1-r}$

We have:

$a_1=-4;\ n=6;\ r=4$

substitute:

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3 years ago

Can anyone help me with the answer for number 4

klio [65]

Answer:

Step-by-step explanation:

Given K is the midpoint of JL, then

JK = KL ← substitute values

6x = 3x + 3 ( subtract 3x from both sides )

3x = 3 ( divide both sides by 3 )

x = 1

Hence

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3 years ago

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Solnce55 [7]

Answer:

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Step-by-step explanation:

3.14 x 10

= 31.40

I'm very sorry if you get it wrong tell me

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2 years ago

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