Calculus
posted by Anonymous .
Wouldn't this sequence be neither geometric and neither arithmetic?
0.0005, 0.005, 0.05, 0.5
I can'f find a pattern.
And also this sequence, it doesnt look arithmetic or geometric
1/5, 1/4, 1/3, 1/2, 1,...
And also this other question:
The first three terms of the sequence defined by tn = 0.3n + 0.5 are
A. 0.5, 0.8, 1.1
B. 0.3, 0.2, 0.7
C. 0.2, 0.1, 0.4
D. 0.3, 0.8, 1.3
How would you do this, I did something with my calculator and got 0.4, so I just chose C as my answer, but how do you actually figure this out?

The first one is GS , the value of r = 10
the 2nd is neither AS nor GS, but the terms can be described by the formula
term(n) = 1/(6n)
for the last,
let n=1 to get term(1) = .3(1) + .5 = 0.2
let n=2 to get term(2) = .3(2) + .5 = 0.1
etc.
what do you think?? 
Oh okay this makes sense. Thanks so much. So the third term would equal 0.4, when you plug in the three for the term number.