Fauxfox
02.10.2019 •
Mathematics
Evaluate the square root of x+7 when x equals 9. write the answer in simplified radical form.
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Ответ:
Option A is correct.
Step-by-step explanation:
We are given
sin∠X = cos∠Y
And value of ∠X= 72°
we need to find value of ∠Y
Putting value of ∠X in the given equation
sin∠X = cos∠Y
sin(72°) = cos∠Y
=> cos∠Y = 0.951
Now we take cos^-1
∠Y = cos^-1(0.951)
∠Y = 18.01 ≈ 18°
So Option A is correct.