9.6 Writing Decay Factors from Word Problems
b=
a=
y=a*bx
vocab word that mean decay factor
Which of the following mean DECAY?
appreciate
depreciate
increase
decrease
reduce
gain
lose
earn
To find the common ratio for GROWTH, you need to                           the growth rate to 1.
To find the common ratio for DECAY, you need to                           the decay rate from 1.
add
subtract
add
subtract
People who had jobs in the coal industry are leaving a small mining town as the industry is dying. The town had 100,000 people in it at the beginning of 2002, and since then 15% of the population leaves every year.
Initial value =
Decay rate =
Decay factor =
%  or  decimal: 
*no commas
*Use a leading
 zero.
An adult takes 400 mg of ibuprofen. Each hour the amount 
of ibuprofen in the person’s system decreases by 
about 29%. How much ibuprofen is left after 6 hours?
Initial value =
Decay rate =
Decay factor =
%  or  decimal: 
*Use a leading
 zero.
Initial value =
Decay rate =
Decay factor =

Radioactive materials like plutonium decay so that 

after a certain time, only half of the original 

material is left. It takes a 120g sample of plutonium 

80 years to decay by half.

***Type your decay factor the way DESMOS would!
%  or  decimal: 
0.5
.5
.50
.05
(Choose all 
versions
that apply.)
You buy a new computer for $2,100. The value of the computer decreases by 49% annually. 
Initial value =
Decay rate =
Decay factor =
%  or  decimal: 
*no commas
*Use a leading
 zero.
Ms. Foster wants to buy a new phone, but she's cheap. Sheknows that every year after a phone is released, its sale price decreases by 30%. The phone she wants originally cost $995. She refuses to pay more than $500. How manyyears must she wait to buy it?
Initial value =
Decay rate =
Decay factor =
%  or  decimal: 
*Use a leading zero and write it like Desmos would!
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