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3 years ago

Multiply the trinomials.

Mathematics

1 answer:

Mekhanik [1.2K]3 years ago

7 0

Answer:

C.) I believe

Step-by-step explanation:

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Suppose an advertising company wants to determine the current percentage of customers who read print magazines. How many custome

user100 [1]

Answer: 543

Step-by-step explanation:

Given : Level of confidence = 0.98

Significance level : $\alpha=1-0.98=0.02$

By using the normal distribution table,

Critical value : $z_{\alpha/2}=2.33$

Margin of error : $E=5\%=0.05$

The formula to find the population proportion if prior proportion of population is unknown :-

$n=0.25(\dfrac{z_{\alpha/2}}{E})^2$

$\Rightarrow n=0.25(\dfrac{2.33}{0.05})^2=542.89\approx543$

Hence, the company survey minimum sample having size =543

8 0

4 years ago

Read 2 more answers

Sleep apnea: Sleep apnea is a disorder in which there are pauses in breathing during sleep. People with this condition must w up

bonufazy [111]

Answer:The required interval is (0.196, 0.030).

Step-by-step explanation:

Since we have given that

n = 432

x = 108

So, $\hat{p}=\dfrac{x}{n}=\dfrac{108}{432}=0.25$

at 99% level of confidence, z = 2.576

So, Margin of error would be

$z\times \sqrt{\dfrac{pq}{n}}\\\\=2.576\times \sqrt{\dfrac{0.25\times 0.75}{432}}\\\\=2.576\times 0.021\\\\=0.0536$

So, margin of error = 0.0536

Now, confidence interval would be

$\hat{p}\pm 0.0536\\\\=(0.25-0.0536,0.25+0.0536)\\\\=(0.1964,0.3036)\\\\\approx (0.196,0.030)$

Hence, the required interval is (0.196, 0.030).

5 0

3 years ago

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WHAT division expression is equivalent to the fraction 37/4 ? HOw can you use thing expression to write a mixed number for 37/4?

Alekssandra [29.7K]

1. Thirty seven divided by four.
2. 37/4= 9.25 or 9 25/100 OR 9 1/4

7 0

3 years ago

Phones-R-Us charges $16.95 per month and $0.05 per text message. Awesome Wireless charges $22.95 per

Dima020 [189]

Answer:

$S \leq 200$

Step-by-step explanation:

Given

Phone R-Us= $16.95 + $0.05 per SMS

Awesome Wireless = $22.95 + $0.02 per SMS

Required

Determine the number of SMS such that Awesome Wireless is greater or equal to Phone R-Us

Represent the SMS with S

For Phone R-Us, we have:

$SMS = 16.95 + 0.05S$

For Awesome Wireless, we have:

$SMS = 22.95 + 0.02S$

For Awesome Wireless is greater or equal to Phone R-Us, we have:

$22.95 + 0.02S \geq 16.95 + 0.05S$

Collect Like Terms

$0.02S - 0.05S \geq 16.95 - 22.95$

$-0.03S \geq -6$

Solve for S

$\frac{-0.03S}{-0.03} \geq \frac{-6}{-0.03}$

$S \leq 200$

Hence: for Awesome Wireless to cost more or equal to Phone R-Us, the number of SMS must not exceed 200

4 0

3 years ago

PLZ HELP ME what is the value of y^-5 / x^-3 for x=2 and y =-4 a)-1/128 b)10/3 c) -128 d) 128

Tomtit [17]

1st, substitute x and y with 2 and -4, which'd be $\frac{-4^{-5}}{2^{-3}}$ .
Then, simplify, to get $-\frac{1}{128}$ .
This would be -0.0078125 in decimal form, or - 1/128 in fraction form.

Hope this helps! ^^

8 0

4 years ago

Read 2 more answers