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Julli [10]
3 years ago
6

The land area of a country is about 3.5 million square miles and the population is about 200 million people. What is the average

population density?
Mathematics
2 answers:
Stolb23 [73]3 years ago
8 0
So the Population density of this place is 800 million people / 3.5 million miles squared

Which equals: 228.57 people / square mile
faltersainse [42]3 years ago
8 0

9514 1404 393

Answer:

  about 57.1 persons per square mile

Step-by-step explanation:

To find persons per square mile, divide persons by square miles:

  (200 million persons)/(3.5 million mi^2) = (200/3.5) persons/mi^2

  ≈ 57.1 persons/mi^2

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D is the answer I just took the test
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Two vertical poles of heights 60 ft and 80 ft stand on level ground, with their bases 100 ft apart. A cable that is stretched fr
Andreyy89

Answer:

Step-by-step explanation:

Given

height of two Poles are 60 and 80 ft

Distance between them is 100 ft

Let x be the distance of Pole of ht 80 ft from Point of stretch

thus length of rope is given by

L=L_1+L_2

L_1=\sqrt{80^2+x^2}

L_2=\sqrt{60^2+(100-x)^2}

L=\sqrt{80^2+x^2}+\sqrt{60^2+(100-x)^2}

differentiate w.r.t x we get

\frac{\mathrm{d} L}{\mathrm{d} x}=\frac{2x}{2\sqrt{80^2+x^2}}-\frac{2\left ( 100-x\right )}{\sqrt{60^2+\left ( 100-2x\right )^2}}

Put \frac{\mathrm{d} L}{\mathrm{d} x}=0 to get minimum value

\frac{2x}{2\sqrt{80^2+x^2}}=\frac{2\left ( 100-x\right )}{\sqrt{60^2+\left ( 100-2x\right )^2}}

squaring

x^2\left ( (100-x)^2+60^2\right )=(100-x)^2(80^2+x^2)

Rearranging

28x^2-1800x+640000=0

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thus L_1=98.312 ft

L_2=73.73 ft

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7 0
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When a system of linear equations is graphed, how is the graph of each equation related to the solutions of that equation?​
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Answer:

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Step-by-step explanation:

7 0
3 years ago
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Burka [1]

Answer:

There are 5 different outcomes, $30, $21, $20, $16 and $11.

Step-by-step explanation:

Bonnie has a total of 6 bills in her pocket. If she takes 3 random bills, this means that there are 20 different possibilities but the five dollar bills and ten dollar bills are not indistinctive so the number is not 20 for this example.

She can take the 1 dollar bill and the two 5 dollar bills which would make 11 dollars.

She can take the 1 dollar bill and the two 10 dollar bills which would make 21 dollars.

She can take the 1 dollar bill, one 5 dollar bill and one 10 dollar bills which would make 16 dollars.

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4 0
4 years ago
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