The function to represent the growth of bacteria will be
a=70*3^b
a is the number of bacteria at time b
b is the number of hour(time)
Explanation:
As per the given information You start your experiment with 70 bacteria,and the bacteria triples in every hour so in
1 hour = 70*3=210 bacteria are formed
2 hour = 210*3=630 bacteria are formed
3 hour=630*3=1,890 bacteria are formed
let a be the number of bacteria at the t=1 hour
if t= 1 hour then
a=70*3^1=210
if t=2 hour then
a=70*3^2=630