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borishaifa [10]

3 years ago

9

This figure consists of two semicircles and a rectangle. What is the perimeter of this figure? Use 3.14 for π . 213.52 m 316.76

m 423.52 m 559.52 m A rectangle with a length of 105 m and a height of 68 m has two semi circles attached that have lengths of 68 m.

2 answers:

Mama L [17]3 years ago

7 0

The correct answer will be 423.52

Galina-37 [17]3 years ago

5 0

Answer:

The correct answer is 423.52

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A homeowner wishes to hang a picture in the middle of a kitchen wall and wants the center of the picture to be exactly 5 3/4 fee

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You place a cup of 200 degrees F coffee on a table in a room that is 67 degrees F, and 10 minutes later, it is 195 degrees F. Ap

Serga [27]

Answer:

It will take a total of twenty minutes

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3 years ago

An educational organization in California is interested in estimating the mean number of minutes per day that children between t

Hatshy [7]

Answer:

The critical value for a 98% CI is z=2.33.

The 98% confidence interval for the mean is (187.76, 194.84).

Step-by-step explanation:

We have to develop a 98% confidence interval for the mean number of minutes per day that children between the age of 6 and 18 spend watching television per day.

We know the standard deveiation of the population (σ=21.5 min.).

The sample mean is 191.3 minutes, with a sample size n=200.

The z-value for a 98% CI is z=2.33, from the table of the standard normal distribution.

The margin of error is:

$E=z\cdot \sigma/\sqrt{n}=2.33*21.5/\sqrt{200}=50.095/14.142=3.54$

With this margin of error, we can calculate the lower and upper bounds of the CI:

$LL=\bar x-z\cdot\sigma/\sqrt{n}=191.3-3.54=187.76\\\\\\UL=\bar x+z\cdot\sigma/\sqrt{n}=191.3+3.54=194.84$

The 98% confidence interval for the mean is (187.76, 194.84).

4 0

3 years ago

Which of the following represents the area of a rectangle whose length is x − 6 and whose width is x − 8? (1 point)

Nat2105 [25]

Answer:

<u>x²-14x+48</u>

Step-by-step explanation:

Area= Length × Width

Area= x-6 × x-8

Area= (x-6)(x-8)

Area= x²-8x-6x+48

Area= x²-14x+48

Hope this helped you- have a good day bro cya)

8 0

3 years ago