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Alik [6]
2 years ago
5

Exchange rates help you to know ____.

Mathematics
1 answer:
Vika [28.1K]2 years ago
3 0

Answer:

B

Step-by-step explanation:

how much your currency is worth in a different currency

hope this helps <3

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there are 9000 four digit numbers. 4536 of the four digit numbers have no repeating digits. How many four digit numbers have at
Shtirlitz [24]

This is subtraction:

9,000-4,536=4,464

5 0
3 years ago
A chemical company makes up batches of copper sulfate solution by adding 250 kg of copper sulfate powder to 1000 liters of water
shepuryov [24]

Answer:

  • 0.07 kg

Step-by-step explanation:

  • <em>Assuming copper sulfate has same density as water</em>

<u>Chemical to water ratio as per given is:</u>

  • 250 kg : 1000 liter = 1 kg : 4 liter

Lab solution is 350 ml

<u>Converting to same ratio as above:</u>

350/(1 + 4) = 70 ml

  • 70 ml : 280 ml = 70 g : 180 ml = 0.07 kg : 180 ml

Answer is 0.07 kg

4 0
2 years ago
HELPPPPP ASAPPPPP PLSSSS
Arte-miy333 [17]

Answer:c

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
The principal at Riverside High School would like to estimate the mean length of time each day that it takes all the buses to ar
Lilit [14]

Answer:

C) 11

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

Since the Confidence is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that z_{\alpha/2}=1.64

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{s}{\sqrt{n}}    

And on this case we have that ME =7 and we are interested in order to find the value of n, if we solve n from the last equation we got:

n=(\frac{z_{\alpha/2} s}{ME})^2  

And replacing the values that we got we have:

n=(\frac{1.64(14)}{7})^2 =10.758 \approx 11

C) 11

8 0
3 years ago
Write this product in its simplest form -5a•6a^8
timofeeve [1]
The rule for the product of similar bases with exponents:

(a^b)(a^c)=a^(b+c)

(-5*6)(a^1)(a^8)

(-30)(a^(1+8))

-30a^9
6 0
3 years ago
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