What is the proper solution for this problem? Subject: Mathematics

1. Find the common difference and the nith term of each harmonic sequence. 1 1 a. 5' 10' 15' , a b. 1 1 1 7' 10' 13' - 10 2. Solve for a. for each harmonic sequence given the first term and the common difference. a. a, if a, = 1 and d = -3 b. a, if a, = - and d = 2 3. Find the ninth term of a Fibonacci Sequence if the eight term is 21. 4. What is the sum of the first ten terms of a Fibonacci sequence if the first term is O