Part1; the nth term of a geometric sequence is given by a_n = 4(0.75)^n-1, write the first five terms, and find the 5th partial sum. (20 points)part2; the nth term of an arithmetic sequence is given by a_n=3n+2, write the first 4 terms and find the 8th partial sum. explain your answers! first five terms: 5th partial sum: first 4 terms: 8th partial sum: