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mr Goodwill [35]
3 years ago
15

Ms.henderson had 3 packages of pencils with 24 pencils in each package. she brought 7 more packages with 24 pencils in each pack

age. the total number of pencils that Ms Henderson had is represented by the expression.
​
Mathematics
1 answer:
Svetach [21]3 years ago
4 0

Answer:

240 pencils

Step-by-step explanation:

10 (24) =  240

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If the mass of a material is 44 grams and the volume of the material is 6 cm^3, what would the density of the material be?
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Density is mass per unit volume.

For the given material that has a mass of 44 grams occupying a volume of 6 cm^3, we divide the mass by the volume, i.e.

density of material = 44 grams / 6 cm^3 = 44/6 grams/cm^3 = 7.3 g/cm^3 (to two significant figures)

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3 years ago
Electricity usage data consists of 45 months has a mean number of units consumed is 390.47 per month with a standard deviation o
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Answer:

The 95% confidence interval for the average monthly electricity consumed units is between 47.07 and 733.87

Step-by-step explanation:

We have the standard deviation for the sample. So we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 45 - 1 = 44

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 44 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.0141

The margin of error is:

M = T*s = 2.0141*170.5 = 343.4

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 390.47 - 343.40 = 47.07 units per month

The upper end of the interval is the sample mean added to M. So it is 390.47 + 343.40 = 733.87 units per month

The 95% confidence interval for the average monthly electricity consumed units is between 47.07 and 733.87

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2 years ago
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Answer:

i hope this helps

Step-by-step explanation:

the pH of the solution is 5.74.

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