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2 years ago

5

A teacher had t packs of notebooks, with 7 notebooks in each. He distributed 3 packs among his students. How many notebooks does

he have left?

1 answer:

vaieri [72.5K]2 years ago

6 0

Answer:

m/c

Step-by-step explanation:

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He puts 1/4 of the treasure to aside for himself he gives 1/2 of what is left to his friend bill he shares 2/3 of the remaining

Andrej [43]

Answer:

24 bars of treasure

Step-by-step explanation:

You just need to do the opposite in order to find the total value since you divided the treasure up we need to multiply the treasure “back”.

3 buried bars is equal to 1/3 of the remaining treasure. Multiply by 3 to get 3/3 or 100% of buried and crew portion. So we now have 9 bars. Then multiply by 2 to get 100% of what was given to bill, crew and buried. We now have 18 bars. Then we know that we took 1/4 for ourselves so that means 18 bars represents 3/4 of the treasure. So when we look at factors of 18 we find that 3 x 6 = 18 and 4 x 6 = 24 so we conclude that we had 24 bars of treasure before the split.

4 0

3 years ago

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

2 years ago

Mnv<br><img src="https://tex.z-dn.net/?f=2%20%5Ctimes%20%5Cfrac%7B7%7D%7B%3F%7D%20%20%3D%204" id="TexFormula1" title="2 \times \

faltersainse [42]

Answer:

? = 7/2

Step-by-step explanation:

? = x

a denominator can’t be equal to 0

x ≠ 0

14/x = 4

14 = 4x

x = 7/2

6 0

2 years ago

Find -48a divided by 8 when a=1 write your answer in simplest form

lukranit [14]

-48a÷ 8 can be written as,

$\frac{-48a}{8}$

Put a=1 in the above exprression and solve.

$\frac{-48\times1}{8}=-6$

Therefore, the solution is -6.

8 0

9 months ago

What is the solution to the equation -2n -2 / 3 =12 ? n =

SVEN [57.7K]

The answer is n= -19/3

3 0

3 years ago