Answer:
Step-by-step explanation:
I'm GUESSING you want to know a value for θ if possible
secθ + tanθ = cosθ/(1 - sinθ)
1/cosθ + sinθ/cosθ = cosθ/(1 - sinθ)
(1 + sinθ)/cosθ = cosθ/(1 - sinθ)
(1 - sinθ)(1 + sinθ) = cos²θ
1 - sinθ + sinθ - sin²θ = cos²θ
1 - sin²θ = cos²θ
1 = cos²θ + sin²θ
which is the unit circle, centered on the origin with radius 1 unit
0 ≤ θ ≤ 2π
√78 is equal to 8.8, so it rounded up it would be placed on the nine on the number line.
-√15 is equal to -3.8 so I would put it at the 3 marker.
It's A. If an instrument is a piano, then it has keys.