Written Homework 7Math 114Please write up your solutions carcfully and completely, using full sentences and units where appropriate. Clearly show each step in your computation. You are graded on both the correctness of your math and the completencss of your explanation/work. You may submit your solutions written on this sheet, but this is not necessary: Feel free to use your own paper instead.(10.3) Consider the geometric series 5-7.5+11.25-16.875+25.3125-dots.(a) Find the values of a and r, as discussed in class and in the textbook.(b) Determine if the geometric serics converges or diverges. If it converges, give the value of the sum. If it diverges, explain how you know.