Question

The first five terms of a sequence are shown.

Answer 1

It is geometric sequence
because ratio 12/4=3, 36/12= 3 and so on
explicit formula for geometric sequence is f(n)=a(1)*r^(n-1)
explicit means you can find any term of a sequence using 1st term and number n that shows location of the term (second ,third ...and so on)

f(n)=4*3^(n-1)