3 years ago

Lines a is perpendicular to line b . Which statement about lines a and b is true ?

Mathematics

1 answer:

sesenic [268]3 years ago

7 0

Answer:

Step-by-step explanation:

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the answer is C, I think because parallel lines never touch

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15. Express 2/5 as a percentage

blsea [12.9K]

Answer:

$40\%$

Step-by-step explanation:

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A newborn baby what weighs 3⁷ kilograms. An adult blue whale weighs 81 times the newborn. How many kilograms does the adult blue

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PLEASE ANSWER ASAP! REALLY IMPORTANT! MUST BE CORRECT! POINTS GIVEN!

VMariaS [17]

- 5/12 + ( - 1/4) =

Adding two negatives results in a negative

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3 years ago

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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