Question

For the annual rate of change of -31% find the corresponding growth or decay factor
A. 0.13
B. 0.96
C. 1.31
D. 1.69

Answer 1

firstly, the negative sign indictaes that this is a decay. Secondly, it is decaying by 31% (or 31 per 100) per annum, or 0.31, however, I dont think any of these answers are right.
certainly C and D represent growth as they are 131% and 169% (1.31 and 1.69 respectively), B represents a decrease of 4% or 0.04, and A represents a decrease of 87% or 0.87, which as you can see does not correspond to to a decrease of -0.31or -31%, are you sure you have supplied all the information in the question(such as a starting point). If you have then I would refer to teacher/tutor for further examination.

Answer 2

thank you so much i accidentally typed the wrong answer for B. it was supposed to be .69.

Answer 3

you are welcome camill2013