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ladessa [460]
3 years ago
8

5.23y+3·(2.7−1.6y) simplify

Mathematics
1 answer:
lubasha [3.4K]3 years ago
3 0

Answer:

0.43y + 8.1

Step-by-step explanation:

5.23y+3(2.7-1.6y)

=5.23y+8.1-4.8y

=0.43y+8.1

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In a random sample of 30 people who rode a roller coaster one day, the mean wait time is 46.7 minutes with a standard deviation
Rainbow [258]

Answer: C. (29,\ 37.8)

Step-by-step explanation:

The confidence interval for difference of two population mean is given by :-

\overline{x}_1-\overline{x}_2\pm z_{\alpha/2}\sqrt{\dfrac{s_1^2}{n_1}+\dfrac{s_2^2}{n_2}}

Given : Level of significance : 1-\alpha:0.99

Then , significance level : \alpha: 1-0.99=0.01

Critical value : z_{\alpha/2}=z_{0.005}=2.576

n_1=30\ ;\ n_2=50\\\\\overline{x}_1=46.7\ ;\ \overline{x}_2=13.3\\\\s_1=9.2\ ;\ s_2=1.9

46.7-13.3\pm(2.576)\sqrt{\dfrac{9.2^2}{30}+\dfrac{1.9^2}{50}}\approx33.4\pm4.38=(29.02\ ,37.78)\approx(29,\ 37.8)

Hence,  a 99% confidence interval for the difference between the mean wait times of everyone who rode both rides (29,\ 37.8)

5 0
4 years ago
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postnew [5]

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6 0
4 years ago
How many more equal angles does a square have than a rectangle?
leva [86]
A rectangle, is a quadrilateral with all angles at 90°.

a square is a quadrilateral with all equal sides, and right-angles all around.

now, the rectangle as well as the square, have all right-angles, the only difference is that the square has all equal-length sides, whilst a rectangle can have pairs of sides that vary in length.
5 0
3 years ago
Which is greater 37/50 or 37%
pychu [463]
37% is grater than 37/50 because 37% if 37/100 and 37/50 is only 0.74%
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4 years ago
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anygoal [31]
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