19 In A Geometric Sequence, The Fourth Term Is 8 Times The First Term. The Sum Of The First 10 Terms Is 2557.5. Find The 10th Term Of This E Sequence. A Population Of Rare Birds, P. Can Be Modelled By The Equation P = Phen, Where P Is The Initial Population, And T Is Measured Decades. After One Decade, It Is Estimated That ? =0.9 R 3 20a. (0) Find The Value

In a geometric sequence, the fourth term is 8 times the first term. The sum of the first 10 terms is 2557.5. Find the 10th term of this, 19. sequence. le A population of rare birds, P, can be modelled by the equation PPet, where P, is the initial population, and t is measured i decades. After one decade, it is estimated that P =0.9. (i) 20a. Find the value of k. (ii) Interpret the meaning of the value of k