4 years ago

Proportional or not proportional 18/72 4/16

1 answer:

7 0

If you want to simplify, its basically division. 18/72 goes to 9/36 4/16 is 1/4 and 9 times 4 is 36. Both problems are proportional to 1/4. Yes

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a. 57 b. 178

Step-by-step explanation:

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13.5x10 = 135

135 - 57 = 78

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2 years ago

two real numbers x and y have the property that their difference is 6 and the difference of their square roots is 1. find the su

Dmitry_Shevchenko [17]

X=12.25 , y= 6.25
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3 years ago

-9=k/6-8<br><br> can anyone help please.

AleksAgata [21]

Answer:

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Step-by-step explanation:

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3 years ago

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Please help me <br><br>If 180°<α<270°, cos⁡ α=−8/17, what is sin -α?

rewona [7]

Starting from the fundamental trigonometric equation, we have

$\cos^2(\alpha)+\sin^2(\alpha)=1 \iff \sin(\alpha)=\pm\sqrt{1-\cos^2(\alpha)}$

Since $180$ , we know that the angle lies in the third quadrant, where both sine and cosine are negative. So, in this specific case, we have

$\sin(\alpha)=-\sqrt{1-\cos^2(\alpha)}$

Plugging the numbers, we have

$\sin(\alpha)=-\sqrt{1-\dfrac{64}{289}}=-\sqrt{\dfrac{225}{289}}=-\dfrac{15}{17}$

Now, just recall that

$\sin(-\alpha)=-\sin(\alpha)$

to deduce

$\sin(-\alpha)=-\sin(\alpha)=-\left(-\dfrac{15}{17}\right)=\dfrac{15}{17}$

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3 years ago

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