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3 years ago

6

Nadia owes her friend $8 for a movie ticket, $3 for popcorn, and $2 for a soda. Which of the following represents how much money

Nadia owes?

2 answers:

Novay_Z [31]3 years ago

8 0

8+2+3= 13. So Nadia owes her friend $13

Vlad1618 [11]3 years ago

8 0

8+3+2=13 that’s how much Nadia owes

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HELP PLEASE! ANSWER 1 AND 2 THIS IS EXTREMELY IMPORTANT!!!!

Mrrafil [7]

Answer:

c and b

Step-by-step explanation:

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3 years ago

How much of a radioactive kind of silver will be left after 50 seconds in the half-life is 25 seconds and you start with 204gram

gizmo_the_mogwai [7]

Answer:

51 grams.

Step-by-step explanation:

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So after 50 seconds ( 2 * 25), 102 * 1/2 = 51 g are left.

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2 years ago

Leno4ka [110]

Answer:

$\frac{s^2-25}{(s^2+25)^2}$

Step-by-step explanation:

Let's use the definition of the Laplace transform and the identity given: $\mathcal{L}[t \cos 5t]=(-1)F'(s)$ with $F(s)=\mathcal{L}[\cos 5t]$ .

Now, $F(s)=\int_0 ^{+ \infty}e^{-st}\cos(5t) dt$ . Using integration by parts with u=e^(-st) and dv=cos(5t), we obtain that $F(s)=\frac{1}{5}\sin(5t)e^{-st} |_{0}^{+\infty}+\frac{s}{5}\int_0 ^{+ \infty}e^{-st}\sin(5t) dt=\int_0 ^{+ \infty}e^{-st}\sin(5t) dt$ .

Using integration by parts again with u=e^(-st) and dv=sin(5t), we obtain that

$F(s)=\frac{s}{5}(\frac{-1}{5}\cos(5t)e^{-st} |_{0}^{+\infty}-\frac{s}{5}\int_0 ^{+ \infty}e^{-st}\sin(5t) dt)=\frac{s}{5}(\frac{1}{5}-\frac{s}{5}\int_0^{+ \infty}e^{-st}\sin(5t) dt)=\frac{s}{5}-\frac{s^2}{25}F(s)$ .

Solving for F(s) on the last equation, $F(s)=\frac{s}{s^2+25}$ , then the Laplace transform we were searching is $-F'(s)=\frac{s^2-25}{(s^2+25)^2}$

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3 years ago

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zhannawk [14.2K]

Answer:

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The probability of selecting a red marble the second time is 1313.

The marble selections are independent and you can multiply the two probabilities to get the following:

probability of getting 2 reds = (13)2(13)2

=19=19.

So the probability of getting two reds is 1919.

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3 years ago

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Darina [25.2K]

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3 years ago

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