Answer
At m=-4, the value is 100.The value of 100 indicates that 4 months before, the number of visitors on the website were 100 as opposed to 8100 after 4 months.
Work Step by Step
n(m)= 8100$\times$$3^{m}$
n(-4)= 8100$\times$$3^{-4}$
= $\frac{8100}{3^{4}}$
= $\frac{8100}{81}$
= 100
