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Yuki888 [10]
3 years ago
10

A company that makes hair-care products has 2,000 people try a new shampoo. Of the 2,000 people, 12 mild allergic reaction. What

percent of the people had a mild allergic reaction.
Mathematics
1 answer:
LiRa [457]3 years ago
5 0
12/2000 = 6/1000 = 0.6/100 = 0.6 percent
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Factor completely<br> n^4 +8n^2 + 15 =
nata0808 [166]

Answer:

The factor form is n^4+8n^2+15 = \quad \left(n^2+3\right)\left(n^2+5\right)

Step-by-step explanation:

When it is required to factor the expression given in the problem, we have to first find a common term or terms, which will be found by either grouping the like terms or the splitting of the terms.

Now the expression that is given here is:

n^4 +8n^2 + 15

Now, here we will take:

u=n^2

Thus we will get:

n^4 +8n^2 + 15\\=u^2+8u+15

Now we will do the middle term split as follows:

u^2+8u+15\\=\left(u^2+3u\right)+\left(5u+15\right)\\=u\left(u+3\right)+5\left(u+3\right)\\=\left(u+3\right)\left(u+5\right)

Substituting back u=n^2 , we will have:

\left(u+3\right)\left(u+5\right)\\=\left(n^2+3\right)\left(n^2+5\right)

Hence, the required factor form of the given expression will be:

n^4+8n^2+15 = \quad \left(n^2+3\right)\left(n^2+5\right)

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What is the derivative of cos(x)?
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Step-by-step explanation:

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(didnt mean to select an answer) can someone help me with this, and if possible please explain it I don't know how to do direct
LiRa [457]

9514 1404 393

Answer:

  (b)  y = -5x

Step-by-step explanation:

When "y varies directly as x" the equation for that is ...

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and the direct variation equation is ...

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_____

<em>Additional comments</em>

There are a couple of other useful facts about direct variation. When you compare the equation to the slope-intercept form equation for a line, ...

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The y-intercept of 0 means that the graph of any direct-variation equation must go through the origin. (If it does not, then the variation is not direct.)

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