3 years ago

Is this a reduction or enlargement?

Mathematics

1 answer:

Nesterboy [21]3 years ago

6 0

Enlargement i think so

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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:

$S_6=-4\cdot\dfrac{1-4^6}{1-4}=-4\cdot\dfrac{1-4096}{-3}=-4\cdot\dfrac{-4095}{-3}=-4\cdot1365=-5460$

Answer: C. -5460

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3 years ago

Which of these is a complex number?

Setler79 [48]

The answer is D.

Explanation: The square root of a negative number is imaginary which is another name for a complex number

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2 years ago

You are running a fuel economy study. One of the cars you find is blue. It can travel 43 1/2 miles on 1 1/4 gallons of gasoline

nignag [31]

Answer:

Blue

Step-by-step explanation:

Blue = 43.5/1.25

34.8 mpg

Red = 21 3/5 / 4/5 = 21.6/0.8

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2 years ago

One fourth of marked price of a watch is given as discount. What is the discount percent

kumpel [21]

Answer:

pretty sure its 25%

Step-by-step explanation:

1/4 is the same as 0.25 which is also the same as 25%

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2 years ago

Someone please help me with this ASAP

liubo4ka [24]

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Step-by-step explanation:

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