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4 years ago

15

In Mrs chapmans math class 2/3 of the students got either an A or a B on the last test of these students 2/5 got a B the model i

llustrates this situation. What fraction of the class got a B on the last test?

1 answer:

tia_tia [17]4 years ago

7 0

1d 2 b I think are the possible answers

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2 years ago

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..................................

yanalaym [24]

Answer:

The answer is a² .

Step-by-step explanation:

You have to substitute x and y into the expression :

$let \: x = a \cos(θ) \\ let \: y = a \sin( θ)$

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Next, you have to apply Basic Trigonometric Identity :

${sin}^{2} θ + {cos}^{2} θ = 1$

${x}^{2} + {y}^{2} = {a}^{2} ( {cos}^{2} θ + {sin}^{2} θ)$

${x}^{2} + {y}^{2} = {a}^{2} (1)$

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3 years ago