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Maksim231197 [3]
3 years ago
8

What is the probability that a randomly selected number from 30 to 61 is divisible by 7 and then divisible by 20 after replacing

first?
Mathematics
1 answer:
devlian [24]3 years ago
7 0
Probability is zero. no solution
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What is the sine value of 7 pi over 6? negative square root 3 over 2 square root 3 over 2 negative 1 over 2 1 over 2?
djverab [1.8K]
First thing to do is to change the radians to degrees so it's easier to determine our angle and where it lies in the coordinate plane.  \frac{7 \pi }{6} * \frac{180}{ \pi }=210.  If we sweep out a 210 degree angle, we end up in the third quadrant, with a 30 degree angle.  In this quadrant, x and y are both negative, but the hypotenuse, no matter where it is, will never ever be negative.  So the side across from the 30 degree reference angle is -1, and the hypotenuse is 2, so the sine of this angle, opposite over hypotenuse, is -1/2
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3 years ago
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