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Solnce55 [7]
2 years ago
15

how much wrapping paper would you need to cover a rectangular that is 18.25 inches by 12inches by 3 inches if you need 10% more

wrapping paper than the surface area of the box? give your answer to the nearest square inch​
Mathematics
1 answer:
natita [175]2 years ago
4 0

Answer: 681 square inch

Step-by-step explanation:

Hi, we have to apply the formula for the surface area:

A = 2wl + 2lh + 2hw

Where:

w: width

l: length

h: height

Replacing with the values given:

A = (2x12x18.25) + (2x12x3)+(2x18.25x3)

A= 438+72+109.25

A=619.5 in2

Since it has to be 10% more than the surface.

619.5 x (10/100) = 61.95 in2

Adding that value to the surface area

619.5+61.95 = 681.45in2 = 681 in2

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Electricity usage data consists of 45 months has a mean number of units consumed is 390.47 per month with a standard deviation o
neonofarm [45]

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

6 0
2 years ago
Anita incorrectly wrote the equation z = w – 18 to describe the pattern in the table.
LiRa [457]

The 63 is the err in her explanation here.

5 0
2 years ago
Read 2 more answers
Please answer this correctly
gayaneshka [121]

Answer:

13

Step-by-step explanation:

8 - (-5) = 13

Since x is the same in both points we only have to count the y

6 0
3 years ago
The Shirt shop sold 15 tshirts. Of the
Sidana [21]

Answer:

12

Step-by-step explanation:

1/5 of 15 is 3. 3 shirts are grey. 15-3 is 12. 12 t shirt are white.

8 0
3 years ago
On a group project, Mira does 24 math questions while Grace does half as many questions. If they have to complete 50 questions,
Troyanec [42]

Answer:

14

Step-by-step explanation:

24+12=36

50-36=14

hope this helped

3 0
2 years ago
Read 2 more answers
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