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3 years ago

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A small class has 9 students, 4 of whom are girls and 5 of whom are boys. The teacher is going to choose two of the students at

random. What is the probability that the first student chosen will be a boy and the second will be a girl?

1 answer:

Mazyrski [523]3 years ago

5 0

20/72 = 10/36 = 5/18

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Read 2 more answers

Evaluate the given integral by changing to polar coordinates. sin(x2 y2) dA R , where R is the region in the first quadrant betw

alexira [117]

Answer:

I = 1.47001

Step-by-step explanation:

we have the function

$f(x,y)=sin(x^2y^2)\\$

In polar coordinates we have

$x=rcos\theta\\y=rsin\theta$

and dA is given by

$dA=rdrd\theta$

Hence, the integral that we have to solve is

$I=\int \limt_2^4 \int \limit_0^{\pi /2}sin(r^4cos^2\theta sin^2\theta)rdrd\theta$

This integral can be solved in a convenient program of your choice (it is very difficult to solve in an analytical way, I use Wolfram Alpha on line)

I = 1.47001

Hope this helps!!!

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Vera_Pavlovna [14]

Step-by-step explanation:

I hope this is correct.

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The average speed that he needs to reach in order to get to 60 miles per hour should be 4 seconds.

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