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Nadya [2.5K]
2 years ago
15

Identify the geometric mean of 8 and 20 in simplest radical form.

Mathematics
1 answer:
Temka [501]2 years ago
4 0

Answer:

8/x = x/20

x^2=160

x=sqrt(160)

x=sqrt(16*10)

x=sqrt(16)*sqrt(10)

x=4*sqrt(10)

Step-by-step explanation:

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Ax) = x² + 4x + 5<br> What is the vertex?
kakasveta [241]

Answer:

(-2,1)

Step-by-step explanation:

6 0
3 years ago
Sheila bought 10 1⁄2 oz of almonds for $3.36. how much did the almonds cost per ounce?
Verdich [7]
Cost per ounce means you take the cost and divide it by the cost: 

<span>3.36 / (21/2) </span>

<span>division of fractions changes to the multiplication of the reciprocal: </span>

<span>3.36 * (2 / 21) </span>

<span>3.36 and has 21 as a factor, so let's cancel it: </span>

<span>0.16 * 2 </span>

<span>$0.32 per ounce</span>
4 0
3 years ago
Ten samples of coal from a northern appalachian source had an average mercury content of 0.242 ppm with a standard deviation of
Dovator [93]
The confidence interval is from 0.2191 to 0.2649, given by

0.242\pm0.0229.

The z-score we need is found by first subtracting the confidence level from 1:
1 - 0.95 = 0.05

Divide that by 2:
0.05/2 = 0.025

Subtract that from 1:
1 - 0.025 = 0.975

Look this up in the middle of a z-table (http://www.z-table.com) and we see that the z-score is 1.96.

Now our confidence interval is given by
\overline{x} \pm z\times \frac{\sigma}{\sqrt{n}}&#10;\\&#10;\\0.242\pm 1.96 \times (\frac{0.037}{\sqrt{10}})&#10;\\&#10;\\0.242 \pm .0229&#10;\\&#10;\\0.242-0.0229=0.2191&#10;\\&#10;\\0.242+0.0229 = 0.2649
5 0
3 years ago
Which value of n makes this equation true?
jonny [76]

Answer:

the answer is A. -16

Step-by-step explanation:

3(-16)+3= -45

-45/5=

-9

5(-16)-1=-81

-81/9=

-9

-9=-9

4 0
3 years ago
John and his three brothers share a cell phone plan. the cell phone company charges a flat rate of $90 per month, which of the f
Alla [95]
Ok...so u have 4 people sharing this plan...they each pay for their own data..however, the $ 90 flat rate is split between them equally.
90/4 = 22.5....so each of them pay 22.50 each for the flat rate.

so John's equation is : 22.5 + 0.25x = 147.50
8 0
3 years ago
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