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Citrus2011 [14]

3 years ago

10

Working alone, it takes Micaela eight hours to mop a warehouse. Jill can mop the same warehouse in 12 hours. Find how long it wo

uld take them if they worked together

1 answer:

Mnenie [13.5K]3 years ago

6 0

Answer:

5 hours?

Step-by-step explanation:

normally, two people would cut the time in half, but she takes forever. half of 12 is 6, half or 8 is 4, so 5, right? the medium answer

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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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r-ruslan [8.4K]

Answer:

6 votes!

Step-by-step explanation:

Albert: 60% of 30= 18

Anthony: 40% of 30= 12

18 - 12= 6

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3 years ago

What is 3515- x = 1396

Afina-wow [57]

Answer:

Step-by-step explanation:

x=2119

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Radius and diame

makvit [3.9K]

Answer:

d = 4 units

Step-by-step explanation:

The diameter is twice the radius

d = 2r

d = 2(2)

d = 4 units

5 0

2 years ago

Can someone please help me get the answer

lara [203]

Answer:

the answer is 6 since from 1 side to the other it makes 12 you just divide 12 by 2 since O is in the middle and only goes to half of the line

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3 years ago