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3 years ago

Is this answer 6?......

Mathematics

2 answers:

Sergeu [11.5K]3 years ago

6 0

Answer: I believe so, putting it in a statement of ____ = _____ should require the statement to be true if you need more help just ask away

Step-by-step explanation:

gayaneshka [121]3 years ago

5 0

Answer:

no, the answer is 10 because they are supplementary lines which equal to 180. So basically 10 takes the place of X when your doing the equation. (shown below) vvvv

Step-by-step explanation:

DE= 8x + 20

EC= 3x + 50

DE= 8(10) +20=100

EC= 3(10) + 50=80

100+80=180

X=10

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Rewrite with only sin x and cos x.

Annette [7]

Option A

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

Solution:

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

7 0

3 years ago

What is 3 times the sixth power of 10

sergey [27]

3000000...........
10^6 =1000000 (3) = 3000000

7 0

3 years ago

Read 2 more answers

50/24= x/495 what does x =

vesna_86 [32]

Answer:

1031.25 =x

Step-by-step explanation:

50/24 = x /495

We can use cross products to solve

50 *495 = 24*x

24750 = 24x

Divide each side by 24

24750/24 =24x/24

1031.25 =x

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3 years ago

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Which expression is equivalent to 7

Nutka1998 [239]

Answer:

ok what teacher gave you this

Step-by-step explanation:

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3 years ago

Brainliest if Correct!! Help QUICK....

Sloan [31]

Replace x with the x value solve to get the y value.

see attached picture for answers.

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2 years ago