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algol [13]
3 years ago
13

What's the probability? Please read carefully

Mathematics
1 answer:
Tamiku [17]3 years ago
5 0
Answer: 5/14

--------------------------------------------------

Explanation:

A = event of drawing a blue card on the first selection
B = event of drawing a blue card on the second selection

P(A) = probability of drawing a blue card on the first selection
P(A) = (number of blue cards)/(number of cards total)
P(A) = 5/8

P(B|A) = probability of getting a second blue card GIVEN the first card is blue
P(B|A) = (number of blue cards left after event A happens)/(number of cards left)
P(B|A) = 4/7

The fact that B depends on A is very important. This happens because the first card is not replaced

Multiply the fractions
P(A)*P(B|A) = (5/8)*(4/7)
P(A)*P(B|A) = (5*4)/(8*7)
P(A)*P(B|A) = 20/56
P(A)*P(B|A) = 5/14

Which is why the answer is the fraction 5/14
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=================================================

Explanation:

Notice how 1080 is a multiple of 360 since 360*3 = 1080. The other values 1450, 780 and 340 are not multiples of 360. For example 1450/360 = 4.02777 approximately. We need a whole number result to show it is a multiple.

Therefore, choice B shows subtracting off a multiple of 360 from the original angle 95. In my opinion, it would be better to write 95+360n or 95-360n to make it more clear we are adding or subtracting multiples of 360.

Choice B will find coterminal angles, but there will be missing gaps. One missing coterminal angle is 95-360 = -265 degrees. So again, 95-360n is a more complete picture. I can see what your teacher is going for though.

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ahrayia [7]

Answer:

\large\boxed{7x^5+4x^3-3x^2}

Step-by-step explanation:

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