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Norma-Jean [14]
3 years ago
11

Hello ! :) please help me with a for me to mark you brainlst :)

Mathematics
2 answers:
bixtya [17]3 years ago
6 0
It’s positive!! hope that helps!
Fittoniya [83]3 years ago
5 0
They are right it’s positive!
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Mice21 [21]

Answer: 235 cm^2

Explanation: you can cut the shape into two smaller ones and then solve for each smaller shapes area. to find out the length of the top piece with 11 as length you can subtract nine from fourteen. from their you calculate the area of the top shape (11x5=55) and then the bottom shape (9x20=180). from their just add the two areas to get 235.

7 0
2 years ago
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18. A set of data has a sample mean of 65.4 and a standard deviation of 1.2. If the sample size is 45, what is the 99% confidenc
Agata [3.3K]

Given:

Sample mean = 65.4

Standard deviation = 1.2

Sample size = 45

Confidence level = 99%

To find:

The confidence interval.

Solution:

The formula for confidence interval is

CI=\overline{x}\pm z^*\dfrac{s}{\sqrt{n}}

where, \overline{x} is sample mean, z* is confidence value, s is standard deviation and n is sample size.

Confidence value or z-value at 99% = 2.58

Putting the given in the above formula, we get

CI=65.4\pm 2.58\times \dfrac{1.2}{\sqrt{45}}

CI=65.4\pm 0.46

CI=65.4-0.46\text{ and }CI=65.4+0.46

CI=64.94\text{ and }65.86

Therefore, the correct option is D.

5 0
2 years ago
To find 27 x 600 just plus 27 + 27+ 27 + 27 + 27 + 27 = 162 then add the zeros in 600. That is the answer
Snowcat [4.5K]
I think so
I hope I helped u
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3 years ago
Use △GHJ, where A, B, and C are midpoints of the sides.
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The answer is 17 , i just know that’s it
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3 years ago
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