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atroni [7]
3 years ago
15

The population of a certain type of gorilla has been decreasing at a rate of about 3.5% per year over the past twenty years. If

there are currently about 250 of theses gorillas, how many were there 20 years ago? (round your answer to the whole number)Immersive Reader
Mathematics
1 answer:
Naddika [18.5K]3 years ago
4 0

Answer:

510 gorillas

Step-by-step explanation:

In this problem, the population of gorillas is decreasing at a rate of 3.5 % per year.

We can write an expression for the population of gorillas as follows:

n(t) = n_0 (1+r)^t

where

n(t) is the number of gorillas after t years

n_0 is the number of gorillas at t = 0

r is the grow rate of the population

t is the number of years

Here we have:

n(t)=250 is the number of gorillas when t = 20 years

r=-\frac{3.5}{100}=-0.035 is the grow rate of the population

So the equation becomes:

250 = n_0 (1-0.035)^{20} = n_0 (0.965)^{20}

And solving for n_0, we find the initial number of gorillas:

250=n_0 (0.965)^{20}=n_0 \cdot 0.490\\n_0 = \frac{250}{0.490}=510

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A train is traveling at a constant speed of 105 miles per hour. How many feet does it travel in 3 seconds? Remember that 1
ipn [44]

Answer:

in 3 seconds the train should travel 462 feet

Step-by-step explanation:

So, first, we convert the miles into feet.

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then, we convert the hour, into second.

Since an hour has 60 minutes, and a minute has 60 seconds, we simply multiply:

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So the train moves 554400 feet every 3600 seconds.

To get how many feet it travels in one second, we divide this by 3600.

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1 and 154.

For every second the train travels 154 feet.

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3 and 462.

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I tried to explain this as simply as I can.

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6 0
3 years ago
A train heads south out of Bloomington an hour after a northbound train
ahrayia [7]

9514 1404 393

Answer:

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Step-by-step explanation:

When the second train leaves the station, the trains are already 63 miles apart. The rate of increase of their separation is (57 +63) = 120 miles per hour. The remaining 243-63 = 180 miles of separation will be achieved in ...

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2 years ago
Please help me with this
Cerrena [4.2K]

Answer:

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Step-by-step explanation:

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AB=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2} \\\\\\\\AB=\sqrt{(0-0)^2+(-1-3)^2} \\\\\\\\AB=\sqrt{0^2+-4^2} \\\\\\AB=\sqrt{16} =4units

Now check the length of the corresponding side DE

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3 years ago
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wariber [46]

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Step-by-step explanation:

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See , we must have full paces, and in this case we are finding the minimum number of paces, so we will be looking at the lowest possible whole number, which in this case, is 307 paces.

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1 year ago
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