## Rubie 3 years ago Input: 0 1 2 3 Output: 5.5 4.2 3.2 2.2 What's the relationship ?

1. Rubie

@AccessDenied can u help me please ?

when Input increase, output will decrease.

3. nubeer

ya seems like linearly decreasing.

4. cinar

it is not linear..

output=-1.3(input)+5.5

linear decreasing

yes

8. nubeer

@cinar it looks linear decreasing , if one value is a lil diff doesnt mean its not linear.

no for first two values

10. Skaematik

There is no formula available. It is not an arithmetric progression because the distance between values is not constant It is not a geometric progression between the ratio of consecutive values is not constant

11. cinar

y=-0.05x^3+0.3x^2-1.55x+5.5

12. nubeer

it's a smiple question .. why making so much complicated.

13. nubeer

why .. doesn't it look linear?

14. cinar

assume that f(x)=ax^3+bx^2+cx+d f(0)=5.5=d f(1)=a+b+c+5.5=4.2 f(2)=8a+4b+2c+5.5=3.2 f(3)=27a+9b+3c+5.5=2.2

15. cinar

a+b+c=-1.3 8a+4b+2c=-2.3 27a+9b+3c=-3.3 after solve this eq. system you'll get a,b,c coeff.

16. cinar