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Harman [31]
3 years ago
15

which of the following lengths cannot be the lengths of a triangle? 4,6,9 a.) 3,4,2 b.) 2,2,3 c.) 1,1,2 d.)

Mathematics
1 answer:
tamaranim1 [39]3 years ago
6 0

Answer:

D. 1, 1, 2

Step-by-step explanation:

A triangles sides have to have the two smallest side's sum add up to be greater than the largest number. In D, 1+1 = 2, and 2 is the largest number, since 2 is not greater than 2, It cannot be a triangle.

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A civil engineer is analyzing the compressive strength of concrete. Compressive strength is normally distributed with σ = 31.62
AysviL [449]

Answer:

A sample size of at least 737 specimens is required.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.99}{2} = 0.005

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.005 = 0.995, so z = 2.575

Now, find the width M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

In this problem, we have that:

M = 3, \sigma = 31.62

So:

M = z*\frac{\sigma}{\sqrt{n}}

3 = 2.575*\frac{31.62}{\sqrt{n}}

3\sqrt{n} = 81.4215

\sqrt{n} = 27.1405

n = 736.60

A sample size of at least 737 specimens is required.

6 0
3 years ago
In an experiment, the independent variable is _______ while the dependent variable is _______.
larisa86 [58]
An independent variable is the variable that can be changed whilst the dependant variable cannot be changed to keep a fair test ✅
7 0
3 years ago
Plzzz help asapppppp
erik [133]

Answer:

X =3

Step-by-step explanation:

X = 3 is the correct answer

3 0
3 years ago
Which is greater, 40% of 70, or 70% of 40? Justify your explanation with work and/or an explanation.
Strike441 [17]

Answer:

0.4 * 70 is 28

.7 * 40 is 28

Step-by-step explanation:

Both are the same.

4 0
2 years ago
Read 2 more answers
2. What’s the answer to this question?
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Answer: The answer would be C. Please give me a thanks :) bye!

Step-by-step explanation:

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