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exis [7]
3 years ago
14

Mrs. Chiu checks 30 problems in 2 minutes. How many problems can Mrs. Chiu check in 68 minutes?

Mathematics
1 answer:
const2013 [10]3 years ago
6 0
1,020. Divide 30 by two get the amount she can do in one minute, you get 15. Then multiply that by 68, and you get 1,020. Hope this helps :)
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Answer:

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Step-by-step explanation:

In this question, we are tasked with writing the product as a sum.

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cosαsinβ = 1/2[ sin(α + β) - sin(α - β)]

From the question, we can say α= 5x and β= 10x

Plugging these values into the equation, we have

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5[sin (15x) - sin (-5x)] = 5[sin (15x) -(-sin(5x))]

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Hence,  10cos(5x)sin(10x) =  5[sin (15x) + sin (5x)]

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