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3 years ago

10

The following graph shows Barry's monthly phone bill and the number of minutes used. About how many minutes did Barry consume if

he pays $55?

1 answer:

hram777 [196]3 years ago

6 0

Answer:

About 27.5 minutes

Step-by-step explanation:

When looking at the graph, you can see that the red line intersects about 27.5 minutes with $55.

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Please help me finish this last one(question) for 21 points.

AnnZ [28]

Step-by-step explanation:

The tables rule is y = x²+x. Thus, the three missing boxes from top to bottom are 6, 5, and 2. Two other rows could be x = 13, y = 182, and x = 0, y = 0.

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3 years ago

What is the geometric mean of 4 and 8? Leave the answer in simplest form.

Norma-Jean [14]

Answer:

I think that it is 1:2

Step-by-step explanation:

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3 years ago

(b) how many measurements must be averaged to get a margin of error of ±0.0001 with 98% confidence? (round your answer up to the

goblinko [34]

Given that the scale readings of the laboratory scale is normally distributed with an unknown mean and a standard deviation of 0.0002 grams.

Part A:

If the weight is weighted 5 times and the mean weight is 10.0023 grams, the 98% confidence interval for μ, the true mean of the scale readings is given by:

$98\% \ C. \ I.=\bar{x}\pm z_{\alpha/2}\left(\frac{\sigma}{\sqrt{n}}\right) \\ \\ =10.0023\pm2.33\left(\frac{0.0002}{\sqrt{5}}\right) \\ \\ =10.0023\pm2.33(0.000089) \\ \\ =10.0023\pm0.00021 \\ \\ =(10.0023-0.00021, \ 10.0023+0.00021) \\ \\ =(10.0021, \ 10.0025)$

Thus, we are 98% confidence that the true mean of the scale readings is between 10.0021 and 10.0025.

Part B:

To get a margin of error of +/- 0.0001 with a 98% confidence, then

$\pm z_{\alpha/2}\left(\frac{\sigma}{\sqrt{n}}\right)=\pm0.0001 \\ \\ \Rightarrow2.33\left(\frac{0.0002}{\sqrt{n}}\right)=0.0001 \\ \\ \Rightarrow\left(\frac{0.0002}{\sqrt{n}}\right)= \frac{0.0001}{2.33} =0.0000429 \\ \\ \Rightarrow\sqrt{n}= \frac{0.0002}{0.0000429} =4.66 \\ \\ \Rightarrow n=4.66^2=21.7156\approx22$

Therefore, the number of <span>measurements that must be averaged to get a margin of error of ±0.0001 with 98% confidence is 22.</span>

8 0

3 years ago

You are driving in France and see the price of gasoline is 2.099 euros per liter. Use the facts below to calculate the price in

Dahasolnce [82]

Answer: $\$10.503$

Step-by-step explanation:

Knowing that the price of gasoline in France is 2.099 euros per liter, you can follow these steps in ordere to calculate the price of the gasoline in US dollars per gallon:

1. Convert 2.099 euros to US dollars:

$(2.099\ euros)(\frac{1\ US\ dollar}{0.7564\ euros})=2.774\ US\ dollars$

Then, the price in US dollars per liter is $2.774\ US\ dollars\ per\ liter$

3. Knowing that:

$1\ liter=1.0567\ quarts\\\\4\ quarts = 1\ gallon$

You can make the conversion from 1.0567 quarts to gallons:

$(1.0567\ quarts)(\frac{1\ gallon}{4\ quarts})=0.2641\ gallons$

4. Set up the following proportion:

$\frac{2.774}{0.2641}=\frac{x}{1}$

Where "x" is the the price in US dollars per gallon.

5. Solving for "x", you get:

$\frac{(2.774)(1)}{(0.2641)}=x\\\\x=10.503$

8 0

3 years ago

What happens to the value of f(x)=log4x as x approaches 0 from the right

SpyIntel [72]

The value of any log function approaches negative infinity as the argument approaches zero from above.

3 0

3 years ago

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