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grandymaker [24]
3 years ago
5

A search plane covers 50 square miles of countryside. How many hectares does the plane search?

Mathematics
2 answers:
LUCKY_DIMON [66]3 years ago
7 0
The plane has searched 12,950 hectares. the ratio between hectares to square miles is: 1 hectare is 2.471 acres
ollegr [7]3 years ago
4 0

Answer:

Step-by-step explanation:

This is a unit conversion from [mi^{2} ] to [ha] which is done using the equivalence:

1 mi^{2}= 258.9988110336 ha

and its done like this:

50 mi^{2}*\frac{258.9988110336 ha}{1 mi^{2} } =12949.94055 ha

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by using the first method,
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3 9/24 + 2 4/24 = (3+2) and (9/24 + 4/24)
when adding 3 and 2 we get 5 and adding 9/24 and 4/24 we get 13/24
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3 years ago
Which of the following triangle cases may have one, two, or zero solutions?
Lunna [17]
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Whatcha of the following represent the solution to the given quadratic inequality? y≤-x^2-3x+10?
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Step-by-step explanation:

6 0
2 years ago
Some transportation experts claim that it is the variability of speeds, rather than the level of speeds, that is a critical fact
scZoUnD [109]

Answer:

Explained below.

Step-by-step explanation:

The claim made by an expert is that driving conditions are dangerous if the variance of speeds exceeds 75 (mph)².

(1)

The hypothesis for both the test can be defined as:

<em>H</em>₀: The variance of speeds does not exceeds 75 (mph)², i.e. <em>σ</em>² ≤ 75.

<em>Hₐ</em>: The variance of speeds exceeds 75 (mph)², i.e. <em>σ</em>² > 75.

(2)

A Chi-square test will be used to perform the test.

The significance level of the test is, <em>α</em> = 0.05.

The degrees of freedom of the test is,

df = n - 1 = 55 - 1 = 54

Compute the critical value as follows:

\chi^{2}_{\alpha, (n-1)}=\chi^{2}_{0.05, 54}=72.153

Decision rule:

If the test statistic value is more than the critical value then the null hypothesis will be rejected and vice-versa.

(3)

Compute the test statistic as follows:

\chi^{2}=\frac{(n-1)\times s^{2}}{\sigma^{2}}

    =\frac{(55-1)\times 94.7}{75}\\\\=68.184

The test statistic value is, 68.184.

Decision:

cal.\chi^{2}=68.184

The null hypothesis will not be rejected at 5% level of significance.

Conclusion:

The variance of speeds does not exceeds 75 (mph)². Thus, concluding that driving conditions are not dangerous on this highway.

7 0
3 years ago
If r and s are positive real numbers, which expression is equivalent to
maw [93]

Answer:

The answer is E

I got it right

Step-by-step explanation:

4 0
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