3 years ago

Verify the identity. sin (x + y) - sin (x - y) = 2 cos x sin y

Mathematics

1 answer:

iren2701 [21]3 years ago

4 0

Sin (x + y) = sin x cos y + sin y cos x

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15DANCE TICKETS WERE SOLD IN ONE HALF HOUR. IF THIS RATE CONTINUES HOW LONG WOULD YOU EXPECT IT TO TAKE TO SELL 270 tickets.

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Answer:

9 hours

Step-by-step explanation:

Using the initial ratio of 15 tickets in half an hour, you can set up a proportion (equivalent ratios) to find the amount of time it would take to sell 270 tickets:

$\frac{tickets}{time}=\frac{15}{0.5}=\frac{270}{x}$

Where 'x' is the amount of time to seel 270 tickets.

Cross-multiply: 0.5(270) = 15x or 135 = 15x

Divide: 15x/15 = 135/15 or x = 9 hours

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GenaCL600 [577]

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Step-by-step explanation:

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3 years ago

Find the vertex of the parabola.

7nadin3 [17]

Answer:

C: (3,1)

Step-by-step explanation:

y = -4x² + 24x - 35

y = -4(x² - 6x) - 35

y = -4[x² - 2(x)(3) + 3² - 3²] - 35

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4 years ago