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2 years ago

What is the relationship between the digit 9 in 79,401

Mathematics

1 answer:

nikdorinn [45]2 years ago

6 0

9,000 or (9×1,000) either one can be the answer

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Please help with #8 !!

Sophie [7]

That would be 6.64 / 1.35 = 4.9 times (to the nearest tenth.)

7 0

2 years ago

Read 2 more answers

PLEASE HURRY I WILL GIVE BRIANLIST Teagan believes she can use a division expression to find the amount of pizza each of 6 frien

Solnce55 [7]

Answer:

The Answer to your question is 1.

Step-by-step explanation:

Teagan is correct in using a division expression because Four-fifths is less than 1.

8 0

2 years ago

A simple random sample of electronic components wil be selected to test for the mean lifetime in hours. Assume that component li

Serjik [45]

Answer:

189 components must be sampled.

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 $1 - \alpha$ .

That is z with a pvalue of $1 - 0.005 = 0.995$ , so Z = 2.575.

Now, find the margin of error M as such

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

Assume that component lifetimes are normally distributed with population standard deviation of 16 hours.

This means that $\sigma = 16$

How many components must be sampled so that a 99% confidence interval will have margin of error of 3 hours?

n components must be sampled.

n is found when M = 3. So

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

$3 = 2.575\frac{16}{\sqrt{n}}$

$3\sqrt{n} = 2.575*16$

$\sqrt{n} = \frac{2.575*16}{3}$

$(\sqrt{n})^2 = (\frac{2.575*16}{3})^2$

$n = 188.6$

Rounding up:

189 components must be sampled.

4 0

3 years ago

1.50μm2. Convert this to square meters.

marishachu [46]

<span>As we know that 1 µm = 10^-6 m On squaring both sides 1 µm2 = 10^-6 x10^-6 m2 1 µm2 = 10^-12 m2</span>

3 0

3 years ago

A commercial jet has been instructed to climb from its present altitude of 6000 feet to a cruising altitude of 30,000 feet. If t

Lunna [17]

An easier way of doing this would be to subtract the initial attitude from the final attitude and divide by the rate of increase
= 30000 - 6000÷4000
= 24000÷4000
=6mins

8 0

2 years ago