vcaa 2010 exam 1 number patterns help!!!!

[spikey]

Question 8 - i would've thought the answer would be C? if the ratio is greater than one? = increasing pattern? But the answers say A :S

http://www.vcaa.vic.edu.au/vcaa/vce/studies/mathematics/further/pastexams/2010/2010furmath1-w.pdf

[Keo]

It can't be C as it curves into another direction later. VCAA purposely flipped the graph so if you look at the paper upside down the answer would be A

[Deank]

I disliked this question, that being said, I got it correct, now you are able to take away C and E immediately because the shape of their graphs implies that they are a cubic and parabola respectively, you'll never encounter either of those in further math number patterns, knowing that the value of r>1, we can take away both B and D, because B represents a graph where the r value is <1, therefore getting smaller as n increases, and D represents a vertically translated square root graph, something that you won't encounter, basically with D, and keeping it within the furthers course, it represents a graph that isn't being multiplied by a number greater than 1, because the further you increase n, the closer it gets to a flat gradient. A is the answer because even though it's negative, it can still be increasing, EG if a = -50, r =2, you get -50,-100,-200 etc, increasing but in the negatives.