If a vertical line is dropped from the x-axis to the point (12, –9) in the diagram below, what is the value of sec theta? a unit circle is shown. A ray intersects (12, negative 9) in quadrant 4. It forms angle theta with the x-axis in quadrant 1.

Defidently don't start answering as quick as possible some teachers do say to read the hardest first but i would think the most logical answer is c carefully read the passages and i structions

Not the answer but here is the graph. 

Frequency is the number of complete oscillations of a wave per second.

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.