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3 years ago

Please let me know the answer, and please provide a detailed explanation.

Mathematics

2 answers:

Evgesh-ka [11]3 years ago

7 0

Answer:

25%

Step-by-step explanation:

With $59.95 nearing to $60 and 79.95 nearing to $80.

80 x 25% =

80 x 1 / 4 =

80 / 4 =

Morgarella [4.7K]3 years ago

5 0

Answer:

B: 25%

Step-by-step explanation:

First, you find that you are trying to find a percent DISCOUNT. Then you take the sale price of $59.95 over the original price $79.95 . It would look like this: 59.95/79.95 . You divide the numbers, and do 1 - the answer (of the division you just did) because 1 means 100% while the answer you got from the division was 0.75 which mean 75 %. You minus those two numbers to get the discount. Hopefully, this is a detailed explanation.

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Which statment descirbes the soloution to a equation<br> a+5(2a-1)+3=11a-2

Andreyy89

Answer:

Any real number.

Step-by-step explanation:

I dunno what you're asking, but Im assuming you need what a equals to.

$a+5(2a-1)+3=11a-2\\a+10a-5+3=11a-2\\11a-2=11a-2\\$

The answer is any real number.

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3 years ago

Real world situation for 834+14s>978-10s

liraira [26]

834+14s=848>978-10s=968

a real life situation for that could be like how many apples 848apples/968total

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3 years ago

There are two different maps of California. The scale on the first map is 1 cm to 20 km. The distance from Fresno to SanFrancisc

mel-nik [20]

Answer:

1500km

Step-by-step explanation:

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8 0

3 years ago

g A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estim

kipiarov [429]

Answer:

a) n= 1045 computers

b) n= 442 computers

c) A. Yes, using the additional survey information from part (b) dramatically reduces the sample size.

Step-by-step explanation:

Hello!

The variable of interest is

X: Number of computers that use the new operating system.

You need to find the best sample size to take so that the proportion of computers that use the new operating system can be estimated with a 99% CI and a margin of error no greater than 4%.

The confidence interval for the population proportion is:

p' ± $Z_{1-\alpha /2}$ * $\sqrt{\frac{p'(1-p')}{n} }$

$Z_{1-\alpha /2}= Z_{0.995}= 2.586$

a) In this item there is no known value for the sample proportion (p') when something like this happens, you have to assume the "worst-case scenario" that is, that the proportion of success and failure of the trial are the same, i.e. p'=q'=0.5

The margin of error of the interval is:

d= $Z_{1-\alpha /2}$ * $\sqrt{\frac{p'(1-p')}{n} }$

$\frac{d}{Z_{1-\alpha /2}} = \sqrt{\frac{p'(1-p)}{n} }$

$(\frac{d}{Z_{1-\alpha /2}})^2 = \frac{p'(1-p')}{n}$

$n * (\frac{d}{Z_{1-\alpha /2}})^2 = p'(1-p')$

$n= [p'(1-p')]*(\frac{Z_{1-\alpha /2}}{d} )^2$

$n=[0.5(1-0.5)]*(\frac{2.586}{0.04} )^2= 1044.9056$

n= 1045 computers

b) This time there is a known value for the sample proportion: p'= 0.88, using the same confidence level and required margin of error:

$n= [p'(1-p')]*(\frac{Z_{1-\alpha /2}}{d} )^2$

$n= [0.88*0.12]*(\frac{{2.586}}{0.04})^2= 441.3681$

n= 442 computers

c) The additional information in part b affected the required sample size, it was drastically decreased in comparison with the sample size calculated in a).

I hope it helps!

4 0

4 years ago

What is the positive root of the equation x ^2 + 5x = 150?

devlian [24]

the awnser I came out with is x=10,-15

6 0

3 years ago

Read 2 more answers