What is the fifth term of the sequence described by this explicit formula gn = 4 (3) n-1

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm2. what is the area of the second triangle?

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.