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1 year ago

The number 3.892 x 10/6 writing in standard

Mathematics

1 answer:

aniked [119]1 year ago

3 0

To write the number is standard form we need to move the decimal point six times to the right, then:

$3.892\times x10^6=3,892,000$

therefore the answer is b.

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—7times(—8) help plz

BabaBlast [244]

Answer:

Step-by-step explanation:

A negative times a negative makes a positive, so:

$-7*(-8)=56$

8 0

3 years ago

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4(x - 1) = - 4 + 4x plz

N76 [4]

4(x-1)=-4+4x
4x-4=-4+4x
-4x -4x
-4=-4

Not sure what the problem was asking, but it’s solvable!

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4 years ago

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Rewrite with only sin x and cos x.

Annette [7]

Option A

$\cos 3 x=\cos x-4 \cos x \sin ^{2} x$

<em><u>Solution:</u></em>

Given that we have to rewrite with only sin x and cos x

Given is cos 3x

$cos 3x = cos(x + 2x)$

We know that,

$\cos (a+b)=\cos a \cos b-\sin a \sin b$

Therefore,

$\cos (x+2 x)=\cos x \cos 2 x-\sin x \sin 2 x$ ---- eqn 1

We know that,

$\sin 2 x=2 \sin x \cos x$

$\cos 2 x=\cos ^{2} x-\sin ^{2} x$

Substituting these values in eqn 1

$\cos (x+2 x)=\cos x\left(\cos ^{2} x-\sin ^{2} x\right)-\sin x(2 \sin x \cos x)$ -------- eqn 2

We know that,

$\cos ^{2} x-\sin ^{2} x=1-2 \sin ^{2} x$

Applying this in above eqn 2, we get

$\cos (x+2 x)=\cos x\left(1-2 \sin ^{2} x\right)-\sin x(2 \sin x \cos x)$

$\begin{aligned}&\cos (x+2 x)=\cos x-2 \sin ^{2} x \cos x-2 \sin ^{2} x \cos x\\\\&\cos (x+2 x)=\cos x-4 \sin ^{2} x \cos x\end{aligned}$

$\cos (x+2 x)=\cos x-4 \cos x \sin ^{2} x$

Therefore,

$\cos 3 x=\cos x-4 \cos x \sin ^{2} x$

Option A is correct

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3 years ago

Need your help, Answer ASAP PLZZ!!!

ss7ja [257]

Answer: m∠IJH = m∠JHL because they are Alternate Interior Angles

Step-by-step explanation:

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3 years ago

The original price of a car is $25000. Each year, its value depreciates (loses value) by 13%. Three years after its purchase, wh

Thepotemich [5.8K]

Answer:

$16,462.58

Step-by-step explanation:

25000(1-.13)^(n)

where n is the years

25000(.87)^3

put this into a calculator and get

16462.57

5 0

3 years ago