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3 years ago

6

A plaine's altitude changes by -1,000 feet. Is the plane going up or down?

1 answer:

SOVA2 [1]3 years ago

8 0

The plane is going down.

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Add the product l(m-n) , m (m-n) , n(n-l)

DochEvi [55]

Step-by-step explanation:

l(m-n)+m(m-n)+n(n-l)

lm-ln+m²-mn+n²-nl

lm-2ln+m²+n²-mn

4 0

3 years ago

Is the function given in the table even, odd, or neither?<br><br> Look at picture

xxMikexx [17]

Answer:

it is odd i think

Step-by-step explanation:

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3 years ago

Two angles are supplementary and one angle is 18° greater than the other. find measure of the angles.

Advocard [28]

one is x

the other is x+18

they add to 180

so x+x+18=180

2x=162

x=81 degrees

x+18=99 degrees

$hope \: its \: helpful \: to \: you \: please \: mark \: me \: a \: brainliest$

8 0

3 years ago

4. Find Percent Change:<br> Original Price $50<br> New Price $60

tino4ka555 [31]

Answer:

20% change

Step-by-step explanation:

20 percent of 50 is 10. 50+10=60.

Brainliest please?

XxRoadToAcexX

5 0

3 years ago

The data below were obtained from an experiment were participants were given drinks with or without caffeine and then asked to t

Black_prince [1.1K]

Answer:

The 95% confidence interval is $244.26 < \mu < 246.95$

The pivot function used is

$t = \frac{\=x - \mu}{ \frac{\sigma}{\sqrt{n} } }$

Step-by-step explanation:

From the question we are told that

The data given is 246 242 248 245 250 244 252 248 248 247 250 248 246 242 248 244 245 246 250 242

The sample size is $n= 20$

Given that the confidence level is 95% then the level of significance is

$\alpha = (100 - 95)\%$

$\alpha = 0.05$

The degree of freedom is mathematically represented as

$df = 20 -1$

$df = 19$

From the student t-distribution table the critical value of $\frac{\alpha }{2}$ is

$t_{\frac{\alpha }{2} , 19 } = 2.093$

The mean is mathematically represented as

$\= x = \frac{\sum x_i}{ n}$

$\= x = \frac{246+ 242 +248+245+ 250+ 244+252+ 248 +248 +247+ 250+ 248+ 246+ 242 +248 +244 +245 +246+ 250+ 242}{20}$ $\= x = 246.6$

The standard deviation is mathematically represented as

$\sigma = \sqrt{\frac{\sum (x_i - \= x )^2)}{n} }$

$\sigma = \sqrt{\frac{(246- 246.6)^2 +(242- 246.6)^2 +(248- 246.6)^2 + (248- 245)^2+}{20} } \ ..$

$\ ...\sqrt{\frac{(250-246.6 )^2+ (244- 246.6)^2+(252- 246.6)^2+ (248- 246.6)^2+ (248- 246.6)^2+}{20} } \ ...$

$\ ..\sqrt{\frac{(247- 246.6)^2+ (250- 246.6)^2+ (248-246.6)^2+ (246-246.6)^2+ (242-246.6)^2+ (248-246.6)^2+ (244-246.6)^2+}{20} } \ ...$ $\sqrt{\frac{ (245-246.6)^2+ (246-246.6)^2+ ( 246-246.6)^2 + ( 250-246.6)^2+ ( 242-246.6)^2 +( 246-246.6)^2+ ( 242-246.6)^2 }{20} }$ $\sigma = 2.87411$

The margin of error is mathematically represented as

$E = t_{\frac{\alpha }{2} , 19} * \frac{\sigma }{\sqrt{n} }$

$E = 2.093 * \frac{2.87411 }{\sqrt{20} }$

$E = 1.345$

The 95% confidence interval is mathematically represented as

$\= x - E < \mu < \= x + E$

=> $245.6 - 1.345 < \mu$

=> $244.26 < \mu < 246.95$

The pivot function used is

$t = \frac{\=x - \mu}{ \frac{\sigma}{\sqrt{n} } }$

8 0

4 years ago