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3 years ago

Please help me with this question.

Mathematics

1 answer:

mixas84 [53]3 years ago

7 0

Answer:

Step-by-step explanation:

In a triangle, the sum of any two sides must be bigger than the third.

For the first one, 10+20=30 is not greater than 30, so this is not correct.

For B, 122+137 = 259 > 257, 257+137>122 , and 257 + 122 > 137. This works

For C, 8.6 + 2.7 = 11.3 < 12.2, so this does not work

For D, 1/6 + 1/5 = 5/(6*5) + 6/(6*5) = 5/30 + 6/30 = 11/30 < 1/2 = 15/30, so this does not work

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What is the risk of going into a group of more than 20 or more people at this time from coronavirus?

olga55 [171]

Answer:

Even if a person doesn't show symptoms, they can still have it.

Step-by-step explanation:

That's the problem.

Even if you think everyone isn't sick, they very well could be, and because there is no vaccine and it spreads so quickly, there's a chance that all the people in that group could get it.

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3 years ago

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In a canoe race, team a is traveling 6 miles per hour and is 2 miles ahead of team

malfutka [58]

Given that <span>In a canoe race, team a is traveling 6 miles per hour and is 2 miles ahead of team b.

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3 years ago

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AveGali [126]

Answer:

So we reject the null hypothesis and accept the alternate hypothesis that rats learn slower with sound.

Step-by-step explanation:

In this data we have

Mean= u = 18

X= 38

Standard deviation = s= 6

1) We formulate the null and alternate hypothesis as

H0: u = 18 against Ha : u > 18 One tailed test .

2) The significance level alpha = ∝= 0.05 and Z alpha has a value ± 1.645 for one tailed test.

3)The test statistics used is

Z= X- u / s

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4) The calculated value of z = 3.33 is greater than the z∝ = 1.645

5) So we reject the null hypothesis and accept the alternate hypothesis that rats learn slower with sound.

First we set the criteria for determining the true of value of the variable. That whether the rats learn in less or more than 18 trials.

Then we find the value of z for the given significance value given and the test about to be checked.

Then the test statistic is determined and calculated.

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The figure shows that the calulated z value lies outside the given z values

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3 years ago

Vertex of y=5x^2-10x+1

kirill [66]

Convert to vertex form:-

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y = 5[(x - 1)^2 - 1] + 1

y = 5(x - 1)^2 - 4

vertex is (1, -4)

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3 years ago

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Aleonysh [2.5K]

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