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3 years ago

9

A bag contains 5 red marbles and 7 blue marbles. You randomly pick a marble and then pick a second without returning the marbles

to the bag. Both marbles are red.

2 answers:

elena-s [515]3 years ago

8 0

Probability(both marbles are red) = 5/12 * 4/11 = 20/132

= 5/33 Answer

babunello [35]3 years ago

6 0

$|\Omega|=12\cdot11=132\\ |A|=5\cdot4=20\\\\ P(A)=\dfrac{20}{132}=\dfrac{5}{33}\approx15\%$

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MARKING AS BRAINLIEST! LAST ATTEMPT! ) show ur work

matrenka [14]

Answer:

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3 years ago

You do not need to flip the inequality sign when solving the following -5 ≤ 4r + 3.

Deffense [45]

Yes.

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7 0

3 years ago

Read 2 more answers

Ocean tides can be modeled by a sinusoidal function. Suppose that there is a low and high tide every 12 hours, and that high tid

USPshnik [31]

Answer:

(a) $y=5sin(\frac{\pi}{6}(x+2))+5$

(b) 7.5ft above the low tide.

Step-by-step explanation:

(a) To find the function that computes the height of the tide, you need to select the form of the sinusoidal function. For example, use the form:

$y=Asin(B(x-C))+D$

Where A is the amplitude, B the frequency, C the phase shift and D the vertical shift.

The amplitude is half the distance between the highest and the lowest tide:

$A=10/2=5ft$

The frequency is related to the period T by:

$B=\frac{2\pi}{T}$

The period is 12 hours, then

$B=\frac{2\pi}{12}=\frac{\pi}{6}$

The high tide is at 1:00 a.m. and 1:00 p.m. , this is the moment when $sin(B(x-C))=1$ , if $sin(\frac{\pi}{2})=1$ then $B(x-C)$ must be equal to $\frac{\pi}{2}$ when $x=1$ :

$B(x-C)=\frac{\pi}{2}\\\frac{\pi}{6}(1-C)=\frac{\pi}{2}\\\frac{1}{6}(1-C)=\frac{1}{2}\\(1-C)=\frac{6}{2}\\-C=3-1\\C=-2$

The vertical shift is the sum of the lowest value, the height of the low tide ( $lt$ ) and the amplitude:

$D=5+lt$

The function is:

$y=5sin(\frac{\pi}{6} (x+2))+5+lt$

Because the function must be the height above low tide height, subtract this heigh from the function:

$y=5sin(\frac{\pi}{6} (x+2))+5+lt-lt$

$y=5sin(\frac{\pi}{6} (x+2))+5$

(b) Use x=11 in the function

$y=5sin(\frac{\pi}{6} (11+2))+5=2.5+5=7.5ft$ above the low tide.

3 0

3 years ago

1+4.25n+3/2p-3+(-2p)+5/4n

alex41 [277]

Answer:

11/2n+-1/2p-2

Step-by-step explanation:

simplification

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3 years ago

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kumpel [21]

A+(-1.6)=-3.7
+1.6 +1.6
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3 years ago

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