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Vsevolod [243]
2 years ago
14

What is the value of 1 x 24 – 3?

Mathematics
2 answers:
Nataliya [291]2 years ago
8 0

Answer:

21

Step-by-step explanation:

Dafna11 [192]2 years ago
8 0

Answer:

21

Step-by-step explanation:

1 \times 24 = 24{anything \: multiplied \: by \: one \: is \: the \: exact \: number} \: so \: 24 - 3 = 21

MARK AS BRAINIEST

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Brewed decaffeinated coffee contains some caffeine. We want to estimate the amount of caffeine in 8 ounce cups of decaf coffee a
rusak2 [61]

Answer:

We would have to take a sample of 62 to achieve this result.

Step-by-step explanation:

Confidence level of 95%.

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 - 0.95}{2} = 0.025

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

That is z with a pvalue of 1 - 0.025 = 0.975, so Z = 1.96.

Now, find the margin of error 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.

Assume that the standard deviation in the amount of caffeine in 8 ounces of decaf coffee is known to be 2 mg.

This means that \sigma = 2

If we wanted to estimate the true mean amount of caffeine in 8 ounce cups of decaf coffee to within /- 0.5 mg, how large a sample would we have to take to achieve this result?

We would need a sample of n.

n is found when M = 0.5. So

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

0.5 = 1.96\frac{2}{\sqrt{n}}

0.5\sqrt{n} = 2*1.96

Dividing both sides by 0.5

\sqrt{n} = 4*1.96

(\sqrt{n})^2 = (4*1.96)^2

n = 61.5

Rounding up

We would have to take a sample of 62 to achieve this result.

8 0
3 years ago
Factor this expression. Select the correct answer from each drop-down menu.
umka21 [38]
The answer is (3x+4)(x-5)
7 0
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Read 2 more answers
Helpppp please any answers
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Step-by-step explanation:

2 + 3 × 6 + 4 × 3

Here, Parantheses should be put,

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= 42

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2 years ago
Sabrina reads 15 pages per hour. She needs to finish a book with 120 pages. Which equation would you use to determine how many h
frozen [14]

Answer:

15x=120

Step-by-step explanation:

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Evaluate if w = –2.1 and z = 5.7.<br> w – z – 4
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The answer will be -13.8
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3 years ago
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