At the start of an experiment, a bacteria colony has mass 
grams. After two hours, 
grams. Find the growth rate r of the colony. Find the mass of the
colony after 10 hours.
> solve(M=M0*exp(r*t),r);
> M0:=2*10^(-9);
> M2:= 1.5*10^(-8);
> r:=solve(M2 = M0 * exp(r*2), r);
> mass_10 := M0 * exp(r*10);
The growth rate of the colony is r = 1.00745. Using this
information, the mass of the colony after 10 hours is 
.