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3 years ago

What is 8c + c = , is it 8cc, 9c, 8c2, 8c

Mathematics

1 answer:

Mnenie [13.5K]3 years ago

8 0

Answer:

Step-by-step explanation:

if you take 8c and add another c, it equals 9c

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At 30 miles an hour how long does it take to travel 180 miles from

Archy [21]

60 min in an hour right? 30 miles means 1 hr. 180/30 = 6. 6 is the number of hr it took to travel 180 miles. make sense?

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3 years ago

If you answer this question you don’t just get brainliest. You also get a cookie

erma4kov [3.2K]

Answer:

Step-by-step explanation:

You first divide 4.2 and 0.7, which is 6. hen you subtract/add left to right, and that equals 6.2, and A is 6.2.

Hope it helps!

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3 years ago

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Integrate dx/3sinx+4cosx

german

$\displaystyle\int\frac{\mathrm dx}{3\sin x+4\cos x}$

A standard approach would be the tangent half-angle substitution:

$t=\tan\dfrac x2\implies\mathrm dt=\dfrac12\sec^2\dfrac x2\,\mathrm dx$

Then

$\sin x=2\sin\dfrac x2\cos\dfrac x2\implies\sin x=\dfrac{2t}{1+t^2}$

$\cos x=\cos^2\dfrac x2-\sin^2\dfrac x2\implies\cos x=\dfrac{1-t^2}{1+t^2}$

from which we get

$\mathrm dx=\dfrac2{1+t^2}\,\mathrm dt$

So the integral becomes

$\displaystyle\int\frac{\frac2{1+t^2}}{\frac{6t}{1+t^2}+\frac{4(1-t^2)}{1+t^2}}\,\mathrm dt=\int\frac{\mathrm dt}{3t+2(1-t^2)}=-\int\frac{\mathrm dt}{2t^2-3t-2}$

Rewrite the denominator as

$2t^2-3t-2=(2t+1)(t-2)$

and expand the integrand into its partial fractions:

$\dfrac1{2t^2-3t-2}=\dfrac15\left(\dfrac1{t-2}-\dfrac2{2t+1}\right)$

We have

$\displaystyle-\frac15\int\frac1{t-2}-\frac2{2t+1}\,\mathrm dt=-\frac15(\ln|t-2|-\ln|2t+1|)+C$

$=\dfrac15\ln\left|\dfrac{2t+1}{t-2}\right|+C$

$=\dfrac15\ln\left|\dfrac{2\tan\frac x2+1}{\tan\frac x2-2}\right|+C$

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3 years ago

What polygon would this be classified as?

notka56 [123]

A four-sided polygon is a <span>quadrilateral.</span>

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6 times -2 over 3 times 1 over 2

zepelin [54]

Answer:

The answer is -2 ❤

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