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3 years ago

Plz help i dont know the answer

Mathematics

1 answer:

Yuliya22 [10]3 years ago

4 0

Answer:

Im not 100 percent sure but I think you have to do this

Step-by-step explanation:

Add all numbers together to find total students

Then add the students in Chemistry and Physics and both together

Then find what that number is in percent to the total students

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I’LL MARK YOU AS BRAINLIEST!!!! Plz no links

Stella [2.4K]

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3 years ago

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(m 3 n + 8)(m 3 n - 5) Please help asap

Verdich [7]

The answer is 9m(with a 2 above the m in 9m) n(with a 2 above the n) +9mm-40

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3 years ago

Please explain your answer as well. Thx!!!

dimulka [17.4K]

Answer:

e^2

Step-by-step explanation:

7 0

3 years ago

Show that cos(3theta) = 4cos3(theta) − 3cos (theta).

Delvig [45]

<u>Step-by-step explanation:</u>

To prove:

$\cos 3\theta=3\cos^3 \theta-3\sin^2 \theta\cos \theta$

Identities used:

$\cos(A+B)=\cos A\cos B+\sin A\sin B$ ......(1)

$\sin 2A=2\sin A\cos A$ ........(2)

$\cos 2A=\cos^2A-\sin^2 A$ .......(3)

$\sin^2A+\cos^2A=1$ .......(4)

Taking the LHS:

$\Rightarrow \cos 3\theta=\cos (\theta +2\theta )$

Using identity 1:

$\Rightarrow \cos (\theta +2\theta )=\cos \theta \cos 2\theta-\sin \theta \sin 2\theta$

Using identities 2 and 3:

$\Rightarrow \cos \theta (\cos ^2\theta-\sin^2 \theta )-\sin \theta (2\sin \theta \cos \theta )\\\\\Rightarrow \cos^3\theta -\sin^2\theta \cos \theta -2\sin^2 \theta \cos \theta \\\\\Rightarrow \cos^3\theta -3\sin^2\theta \cos \theta$

Using identity 4:

$\Rightarrow \cos^3\theta -3(1-\cos^2\theta) \cos \theta\\\\\Rightarrow \cos^3\theta-3\cos \theta+3\cos^3\theta\\\\\Rightarrow 4\cos^3\theta -3\cos \theta$

As, LHS = RHS

Hence proved

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3 years ago

Keith's high school played 15 soccer games this year. the team won most of their games. They were defeated during 2 games. Write

zepelin [54]

Answer:

13 = x 15 - x = 2

Step-by-step explanation:

15-x=2

15-13=2

7 0

3 years ago