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3 years ago

-11× (-4) =___ 44 2/15 - 44 2/15 - 49 49

Mathematics

1 answer:

pantera1 [17]3 years ago

3 0

Answer:

Step-by-step explanation:

-×-=+

11×4=44

so it's equal to =+44

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If x varies directly with y and x = 3.5 when y = 14, find x when y = 18.

maks197457 [2]

Answer:

x = 4.5

Step-by-step explanation:

there's definitely other ways to solve this, but I used a proportion.

$\frac{3.5}{x} = \frac{14}{18}$

Then you can make this equation:

14x = 3.5 * 18

I solved for it and got 4.5 .

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3 years ago

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lesya [120]

Answer:

$10,000

Step-by-step explanation:

Cross multiply and divide by 55.

Hope this helps!

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2 years ago

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Use technology and the given confidence level and sample data to find the confidence interval for the population mean mu. Assume

Sphinxa [80]

Answer: (1.55, 6.45)

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\overline\ {x}\pm\ z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

Given : Significance level : $\alpha: 1-0.99=0.01$

Critical value : $z_{\alpha/2}=2.576$

Sample size : n=41

Sample mean : $\overline{x}=4.0\text{ kg}$

Standard deviation : $\sigma=6.1\text{ kg}$

Then, 99% confidence interval for population mean will be :_

$4\pm\ (2.576)\dfrac{6.1}{\sqrt{41}}\\\\\approx4\pm2.45\\\\=(4-2.45, 4+2.45)=(1.55, 6.45)$

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3 years ago

Suppose you use have $50 and earn $8 per hour. How many hours must you work until you have $170

Nataly_w [17]

15. $170-$50= $120/$8= $15

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3 years ago

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An item that was selling for $72.00 was reduced to $60.00. Find the percent decrease in price. Show all your work.

dsp73

The formula to figure out the percentage increase or decrease is:
(new - old) / old * 100% 

new = 60 
old = 72 

(60 - 72) / 72 * 100% 
-12 / 72 * 100% 
= -1/6 * 100% 
= -0.1666... * 100% 
≈ -16.667% 

Because it is negative, that's a decrease. 

Answer: 
A decrease of about 16.7%

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3 years ago