Verified Answer :

apologiabiology

not sure
te rate is r
for decay, it is
A=P(1-r)^t
r=rate
P=present amount
dunno what b is
but I guess
A=28000(1-0.13)^t
A=28000(0.87)^t
I would guess the decay factor would be 0.87

ericcaa66

your equation for the prblem is a=p(1-r)^t

when you put $28,000 as A and make 13% into 0.13 and solve your B comes to 0.87. hope this was helpful :)