Need Help!!!

Hey, Would anybody please help me with the following sums. 1. The infinite sequence a1, a2,…, an,… is such that a1 = 2, a2 = -3, a3 = 5, a4 = -1, and an = an-4 for n > 4. What is the sum of the first 97 terms of the sequence? A. 72 B. 74 C. 75 D. 78 E. 8 2. On a map Town G is 10 centimeters due ...