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dexar [7]
2 years ago
13

Which expression is the result of subtracting (Z2-3i) from (Z1 + 2)? A B C D

Mathematics
2 answers:
Reika [66]2 years ago
4 0

Answer:

im not sure but ill try i think A

hichkok12 [17]2 years ago
4 0

Answer:

C

Step-by-step explanation:

Got it right on Edge

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Whats the greatest common factor of 18 and 27 and 54
vodomira [7]

Answer: 9

Step-by-step explanation:

From doing the math I think it should be 9

7 0
3 years ago
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A clinical trial was conducted to test the effectiveness of the drug zopiclone for treating insomnia in older subjects. Before t
aleksklad [387]

Answer:

We cannot say that the mean wake time are different before and after the treatment, with 98% certainty. So the zopiclone doesn't appear to be effective.

Step-by-step explanation:

The goal of this analysis is to determine if the mean wake time before the treatment is statistically significant. The question informed us the mean wake time before and after the treatment, the number of subjects and the standard deviation of the sample after treatment. So using the formula, we can calculate the confidence interval as following:

IC[\mu ; 98\%] = \overline{y} \pm t_{0.99,n-1}\sqrt{\frac{Var(y)}{n}}

Knowing that t_{0.99,15} = 2.602:

IC[\mu ; 98\%] = 98.9 \pm 2.602\frac{42.3}{4} \Rightarrow 98.9 \pm 27.516

IC[\mu ; 98\%] = [71.387 ; 126,416]

Note that 102.8 \in [71.384 ; 126.416] so we cannot say, with 98% confidence, that the mean wake time before treatment is different than the mean wake time after treatment. So the zopiclone doesn't appear to be effective.

7 0
3 years ago
How many 1/10's are in 2/5?
goblinko [34]
There is 4 1/10's in 2/5.

You do this by turning 2/5 into a fraction with a denominator of 10, so it will be 4/10. 1/10 + 1/10 + 1/10 + 1/10 = 4/10
3 0
3 years ago
Angle K measures 67º and angle L measures 119°.
DaniilM [7]

Answer:

C.  m Angle M = 113o and m Angle N = 61o

Step-by-step explanation:

It's the only answer that makes all the angles added together equal 360 degrees.

67 + 119 + 113 + 61 = 360

5 0
2 years ago
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The volume of a triangular prism is increased by a factor of 8.
Allushta [10]

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4

Step-by-step explanation:

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3 years ago
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