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shepuryov [24]
3 years ago
6

Answer this: : : : : : : : : : : : : : : : : : : :

Mathematics
1 answer:
Alenkasestr [34]3 years ago
3 0
A = bh 
1440 = b * 32
1440/32 = 45
1440 = 45 * 32

b = 45
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if there r 4 students and The cost for a skating rink cost $35 per student how much will it cost for 60 students
Arte-miy333 [17]

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3 years ago
What shapes are formed by cross sections parallel to the base of a hexagonal pyramid?
siniylev [52]

The answer is the option B, which is: B. Similar hexagons.

The explanation for this answer is shown below:

By definition, a cross section is the shape that is formed when a plane cuts or makes a slice through a solid.

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3 years ago
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Neporo4naja [7]
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7 0
2 years ago
Read 2 more answers
A physicist examines 25 water samples for nitrate concentration. The mean nitrate concentration for the sample data is 0.165 cc/
xz_007 [3.2K]

Answer:

The 80% confidence interval for the the population mean nitrate concentration is (0.144, 0.186).

Critical value t=1.318

Step-by-step explanation:

We have to calculate a 80% confidence interval for the mean.

The population standard deviation is not known, so we have to estimate it from the sample standard deviation and use a t-students distribution to calculate the critical value.

The sample mean is M=0.165.

The sample size is N=25.

When σ is not known, s divided by the square root of N is used as an estimate of σM:

s_M=\dfrac{s}{\sqrt{N}}=\dfrac{0.078}{\sqrt{25}}=\dfrac{0.078}{5}=0.016

The degrees of freedom for this sample size are:

df=n-1=25-1=24

The t-value for a 80% confidence interval and 24 degrees of freedom is t=1.318.

The margin of error (MOE) can be calculated as:

MOE=t\cdot s_M=1.318 \cdot 0.016=0.021

Then, the lower and upper bounds of the confidence interval are:

LL=M-t \cdot s_M = 0.165-0.021=0.144\\\\UL=M+t \cdot s_M = 0.165+0.021=0.186

The 80% confidence interval for the population mean nitrate concentration is (0.144, 0.186).

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3 years ago
I HAVE 8 MORE MINUTES
KonstantinChe [14]

Answer:

6

Step-by-step explanation:

Estimate it kid. Look at the existing dots.

6 0
3 years ago
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