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2 years ago

( please help!! I will give brainliest tysm! ) The diameter of a carbon atom is 2.2 × 10 -8cm. Write this as a whole number

Mathematics

2 answers:

Alex_Xolod [135]2 years ago

8 0

Answer:

The answer is -220000000.

Step-by-step explanation:

First multiply 10 X-10 X-10 X-10 X-10 X-10 X-10 X-10 and you will get -100000000 then multiply 2.2.

Lyrx [107]2 years ago

3 0

Answer:

it is 0.000000022 cm as a number but rounded to 0 as a whole number

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Grace and her brother Sid want to raise money to go to band camp. Their parents have agreed to help them up to $400 by paying th

Cerrena [4.2K]

Answer:

I think it would be 25m + 10b = 400

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2 years ago

Prove that the difference between a two-digit number and the product of its digits will always be a 2 digit number.

slamgirl [31]

Step-by-step explanation:

Let the two-digit number is $xy$

This can be written as:

10x + y, where 1 ≤ x ≤ 9 and 0 ≤ y ≤ 9

The difference between the number and product of its digits is:

d = 10x + y - xy

Rewrite this as below:

d = 10x - xy + y - 10 + 10 =

x(10 - y) - (10 - y) + 10 =

(x - 1)(10 - y) + 10

We see that:

0 ≤ x - 1 ≤ 8 according to the condition given above
1 ≤ 10 - y ≤ 10 again according to the condition given above

The value of d is then:

0 + 10 ≤ d ≤ 8*10 + 10
10 ≤ d ≤ 90

<h3>Proved</h3>

7 0

2 years ago

Read 2 more answers

Principal Zimmer wants to make sure that students have enough time to get across campus between classes. To see how long it take

Len [333]

Answer:

the answers is step 3

Step-by-step explanation:

i took the test

7 0

3 years ago

Paul left for school at 7:25 AM. He returned home at 3:15 PM. How long was Paul away from home?

Nikitich [7]

7.25 until 8.00 = 35 minutes

8.00 until 3.00 PM = 7 hours

3.00 until 3.15 = 15 minutes

Answer is 7 hours 50 minutes

7 0

3 years ago

The shape of the distribution of the time required to get an oil change at a 20 minute oil change facility. However, records ind

Katyanochek1 [597]

Answer:

For a mean oil change time of 20.51 minutes there would be a 10% chance of being at or below

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal probability distribution

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this problem, we have that:

$\mu = 21.3, \sigma = 3.9, n = 40, s = \frac{3.9}{\sqrt{40}} = 0.6166$

Treating this as a random sample, at what mean oil-change time would there be a 10% chance of being at or below?

This is the 10th percentile, which is X when Z has a pvalue of 0.1. So it is X when Z = -1.28.

$Z = \frac{X - \mu}{\sigma}$

By the Central Limit Theorem

$Z = \frac{X - \mu}{s}$

$-1.28 = \frac{X - 21.3}{0.6166}$

$X - 21.3 = -1.28*0.6166$

$X = 20.51$

For a mean oil change time of 20.51 minutes there would be a 10% chance of being at or below

6 0

3 years ago