4 years ago

Help me!!! It’s not BIBBLI!

Mathematics

1 answer:

den301095 [7]4 years ago

3 0

Answer:

We need the answer sheet to answer the question for you

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18<br> (cos+ i sin ) ¹8<br> 6

sergeinik [125]

Answer:

-1.

Step-by-step explanation:

1) according to the DeMoivre's theorem:

$1*(cos\frac{ \pi}{6} +isin\frac{ \pi}{6})^{18}=1^{18}(cos(18*\frac{ \pi}{6})+isin(18*\frac{ \pi}{6}))=cos3\pi +isin3\pi =cos\pi +isin\pi ;$

2) if cos(π)=-1 and sin(π)=0, then cosπ+i*sin(π)=-1.

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2 years ago

Half the sum of 5 and a number b algebraic expression

Anika [276]

Answer:

the answer to this is 1/2(5+b)

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2 years ago

kirill [66]

X = ( 10x + 2x)

That is saying he only refilled once

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3 years ago

0.1x+0.2y=-1;0.5x-0.9y=6.4

Harman [31]

.1x+.2y=-1
.5x-.9y=6.4

×-5 equation .1x+.2y=-1

-.5x-y=5
.5x-.9y=6.4

solve by elimination

-1.9y=11.4
÷-1.9 both sides
y=-6

solve for X

.1x+.2 (-6)=-1
.1x-1.2=-1
+1.2 both sides
.1x=.2
÷ 1 both sides
x=2

plug into 2nd equation to see if it's true

x=2
y=-6

0.5(2)-0.9(-6)=6.4
1+5.4=6.4
6.4=6.4 answers hold true

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4 years ago

The expression -2(x-4) is the same as

Ksenya-84 [330]

Answer:

-2x-8

Step-by-step explanation:

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3 years ago