Sin means to divide the opposite side measure by the hypotenuse. Cos is equal to the adjacent side value divided by the hypotenuse. Tan is equal to the opposite value divided by the adjacent. To remember this, I use the abbreviation SOHCAHTOA. SOH for Sin is Opposite over Hypotenuse, and so on.
Answer:

Step-by-step explanation:
The first thing that would need to be done is solving for y. This problem has already done this. The next step is to exchange y for 
That is all. This would mean that the function notation for the equation would be: 
Answer:
1
Step-by-step explanation:
Since there are no common prime factors, the only common factor for c²d² is 1, therfore it stays as is, c²d².
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I think maybe 3) would make the most sense because she wants a random sample of students and the other options are specific on the type of students.