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3 years ago

7

There is only one city in Delaware county and that is dunston. The population of dunston is 6549. There are 43118 people living

in Delaware county but not in dunston. What is the total population of Delaware county.

1 answer:

WARRIOR [948]3 years ago

6 0

Honestly this makes no logical sense but you should take 43,118+6,549=49,667

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cestrela7 [59]

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Let $\mu$ and $\sigma^2$ denote the mean and variance of the random variable x. determine $e[(x-\mu)/\sigma]$ and $e{[((x-\mu)/\

Nezavi [6.7K]

$\mathbb E\left(\dfrac{X-\mu}{\sigma}\right)=\dfrac1\sigma\mathbb E(X)-\dfrac\mu\sigma=\dfrac{\mu-\mu}\sigma=0$

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4 years ago

Two trains travel at right angles to each other after leaving the same train station at the same time. Two hours later they are

hjlf

Answer:1547.9 miles per hour

Step-by-step explanation:

Let the two trains leave in x direction and y direction

Velocity of train in x direction be v

therefore velocity of train in Y direction is v+29

because one train is 29 miles per hour slower than other.

Distance travel by train in x direction is(x) v(2)

Distance travel by train in y direction is(y) 2(v+29)

distance between them after 2 hours is 4420 miles

Now using pythagoras theorem

$x^2+y^2=\left ( 4420\right )^2$

$\left ( 2v\right )^2+\left ( 2\left ( v+29\right )\right )^2=\left ( 4420\right )$

on solving

$2v^2+58v-4881699=0$

v= $\frac{-58\pm \sqrt{\left ( 58 \right )^2+4\cdot 2\cdot4881699}}{2\cdot 2}$

v=1547.889 miles per hour

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3 years ago

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Zolol [24]

Answer:

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Step-by-step explanation:

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Paraphin [41]

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