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VashaNatasha [74]

3 years ago

10

Jessica has a bag of marbles. there are 7 red and 3 blue. she reaches in and pulls out a red on the first draw. she then reaches

in for her second draw, without replacing the first marble. what is the probability that Jessica will pull out 2 red marbles

1 answer:

meriva3 years ago

5 0

I think it's 2 1/3 chances to pick out 2red marbles.

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Answer:

See Below.

Step-by-step explanation:

We want to show that the function:

$f(x) = e^x - e^{-x}$

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A function is increasing whenever its derivative is positive.

So, find the derivative of our function:

$\displaystyle f'(x) = \frac{d}{dx}\left[e^x - e^{-x}\right]$

Differentiate:

$\displaystyle f'(x) = e^x - (-e^{-x})$

Simplify:

$f'(x) = e^x+e^{-x}$

Since eˣ is always greater than zero and e⁻ˣ is also always greater than zero, f'(x) is always positive. Hence, the original function increases for all values of <em>x.</em>

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