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ollegr [7]
2 years ago
6

Helppppp plzzzzzzz!!!!!!!!!!!! 20+ Pts and brainliest!!!!!!

Mathematics
1 answer:
Alex Ar [27]2 years ago
6 0

Answer:

Y=3

Step-by-step explanation:

in the first to second step: -2(7-y)+4=-4 to -14-2y+4=-4, the part -2(7-y) should equal -14+2y instead of 14-2y because two negative signs add to be positive

so y should be 3

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Please help me with this question!! I also need the steps
e-lub [12.9K]

Hi there!

\large\boxed{x = \frac{\pi}{3} \text{ and } \pi}

We are given:

cos(7x)cos(4x) = -1 - sin(7x)sin(4x)

Begin by moving all terms with variables to one side:

cos(7x)cos(4x) + sin(7x)sin(4x) = -1

The corresponding trig identity is cos(A - B). Thus:

cos(7x - 4x) = cos(7x)cos(4x) + sin(7x)sin(4x) = -1

cos(3x) = -1

cos = -1 at  π, so:

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We can also find another solution. Let 3π = -1:

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8 0
3 years ago
Describe the distribution of the data with regard to the shape, outliers, center, and spread.
Pepsi [2]
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MariettaO [177]
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