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Verdich [7]
3 years ago
14

Social Science predicts that the population of barre, Vermont will double every 54 years. If the population in 1974 was 56000, i

n what year should we expect the population to reach 71000
Mathematics
1 answer:
docker41 [41]3 years ago
7 0

Answer:

We should expect the population to reach 71000 in 1993.

Step-by-step explanation:

If the population will double every 54 years and the population in 1974 was 56000 people, then the function that represents this situation is

y=56000\cdot 2^{\frac{x}{54}},

where x is time in years since 1974.

Nota that in 1974, x=0, then y=56000 and after 54 years the population will be y=56000\cdot 2^{\frac{54}{54}}=56000\cdot 2=112000.

Therefore, you have to calculate x, when y=71000:

71000=56000\cdot 2^{\frac{x}{54}},\\ \\\dfrac{71}{56}=2^{\frac{x}{54}},\\ \\\dfrac{x}{54}=\log_2\dfrac{71}{56},\\ \\x=54\log_2\dfrac{71}{56}\approx 18.49

Thus, we should expect the population to reach 71000 in 1993 (after full 19 years).

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Answer:

Option (3)

Step-by-step explanation:

To prove ΔULV ≅ ΔKLY,

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Step-by-step explanation:

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aleksandr82 [10.1K]

Answer:

3[|AB|² + |BC|² + |AC|²] = 4[|AD|² + |BE|² + |CF|²]

Step-by-step explanation:

I've attached an image showing a triangle divided into it's medians.

Now, from the attached image, we see that AB, BC & CD are the lengths of sides of triangle while AD, BE & CF are lengths of the 3 medians of the triangle.

Now, to prove our question, we will use appolonius theorem which states that "the sum of the squares of any of the two sides of a triangle is equal to twice the square on half the third side including twice the square on the median that bisects the third side.

Applying this theorem to the image attached, we have the following;

|AB|² + |AC|² = 2[|AD|² + |BC/2|²]

|AB|² + |BC|² = 2[|BE|² + |AC/2|²]

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Adding the 3 equations above gives us;

2|AB|² + 2|BC|² + 2|AC|² = 2|AD|² + |BC|²/2 + 2|BE|² + |AC|²/2 + 2|CF|² + |AB|²/2

Collecting like terms;

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3[|AB|² + |BC|² + |AC|²] = 4[|AD|² + |BE|² + |CF|²]

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