[填空题]
A population of goldo; *m,av)botq(pv; (narqsh5fb1;bcptrgzed.) o (q1 ish decreases exponentially. The size of the population, P , after t days is modelled by thecp 1 )qbzd(erg1b;t o. function
$P(t)=8000 \times 2^{-t}+100, \quad t \geq 0 \text {. }$
1. Write down the exact size of the initial population.
2. Find the size of the population after 5 days.
3. Calculate the time it will take for the size of the population to decrease to 120 .
The population will stabilize when it reaches a size of n .
4. Write down the value of n .
