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3 years ago

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HELP ME WITH IXL! SOMEONE, PLEASE HELP ME WITH IXL... THIS IS CONFUSING FOR ME. AND PLEASE PUT A EXPLANATION TO YOUR ANSWER... P

LEAsee Helpp

1 answer:

rodikova [14]3 years ago

4 0

WHAT GRADE ARE YOU IN

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The sum of first 'n' terms. Sn of a particular Arithmetic Progression is given by Sn=12n-2n^2. Find the first term and the commo

Vitek1552 [10]

Answer:

d=-4 and a=10

Step-by-step explanation:

The sum of a arithmetic sequence is given by (n/2)*(2a+(n-1)d). Comparing coefficients with the given Sn, we have; a-d/2=12 and d/2=-2, d=-4 and a=10.

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3 years ago

(1+cos2x)/(1-cos2x) = cot^2x

sesenic [268]

We will turn the left side into the right side.

$\dfrac{1 + \cos 2x}{1 - \cos2x} = \cot^2 x$

Use the identity:

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

$\dfrac{1 + \cos^2 x - \sin^2 x}{1 - ( \cos^2 x - \sin^2 x)} = \cot^2 x$

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

Now use the identity

$\sin^2 x + \cos^2 x = 1$ solved for sin^2 x and for cos^2 x.

$\dfrac{\cos^2 x + \cos^2 x }{\sin^2 x + \sin^2 x} = \cot^2 x$

$\dfrac{2\cos^2 x}{2\sin^2 x} = \cot^2 x$

$\dfrac{\cos^2 x}{\sin^2 x} = \cot^2 x$

$\cot^2 x = \cot^2 x$

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2 years ago

the amount y of your friends allowances if the amount she receives is 2$ more than the amount x you receive

liberstina [14]

Hello, How are you doing today?

If your friend makes 2$ more than you do, then you must form an equation for the problem. y = amount she has, x = your amount. Therefor, it would be:

y = x + 2

If you make 6 dollars, she will make 8 and so on. Thank you, have a nice day!

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3 years ago

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dimulka [17.4K]

Answer:

bruh

Step-by-step explanation:

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2 years ago

When driving at night, you should dim your headlights when:

Tatiana [17]

Answer:

Meeting or following another vehicle

Step-by-step explanation:

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2 years ago