The trigonometric function secant is the reciprocal of the trigonometric cosine. In Quadrant II, cosines are negative as it is only the sines and cosecant that are positive. From these, it is conclusive that the function sec is also negative.
No, to be proportional, there would be a consistent pattern between x and y. For example 2 times 2.5 is 5. And 3 times 2 is 6. The ratio is not the same.
Answer:
1, 3, 6, 10, 15, 21, 28, 36. Notice that the first 2 terms are odd, followed by another 2 even terms, and then another 2 odd terms, before 2 even terms again.