Question 1089272
{{{y=p*b^x}}}
<pre>y, population
p, initial population
x, time in days
b, base related to growth rate
</pre>


{{{1.4=1*b^1}}}
{{{b=1.4}}}


MODEL:  {{{y=p*(1.4)^x}}}




The Second Question:
{{{system(x=what, y=90000,p=1000)}}}

{{{1000*(1.4)^x=90000}}}

{{{1.4^x=90}}}

{{{log((1.4^x))=log((90))}}}

{{{x*log((1.4))=log((90))}}}

{{{x=log((90))/log((1.4))}}}


{{{x=13.373}}}


x=13
to nearest whole number of days