There are 20 bears in a zoo. What will be their population after 3 years, if the population doubles each year?

Mathematics

1 answer:

shepuryov [24]3 years ago

5 0

Answer:

160

Step-by-step explanation:

20 x 2 = 40

40 x 2 = 80

80 x 2 = 160

It stops at 3 years.

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Suppose y varies directly with x. if y=-3 when x=5 find y when x=-1

Scrat [10]

$\bf \begin{array}{cccccclllll}
\textit{something}&&\textit{varies directly to}&&\textit{something else}\\ \quad \\
\textit{something}&=&{{ \textit{some value}}}&\cdot &\textit{something else}\\ \quad \\
y&=&{{ k}}&\cdot&x

&& y={{ k }}x
\end{array}
\\ \quad \\
\textit{we know that, when}
\begin{cases}
y=-3\\
x=5
\end{cases}\implies y=kx\implies (-3)=k(5)$

solve for "k", to find the "constant of variation",
then plug it back in the y = kx, to get the equation
now
what's is y when x = -1?
well, just plug that in the equation with the found "k" value,
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3 years ago

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soldier1979 [14.2K]

Answer:

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iren2701 [21]

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3 years ago

What is f(x)=4x^2+19<br> find f(-5)

katovenus [111]

Answer:

Step-by-step explanation:

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Hi I’ll appreciate it if you help me!

dexar [7]

The answer would be 30in.
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