1 Find the integer a such that (Pay attention that a is NOT remainder in this case) a) a 15 (mod 27) and -26S as 0. b) a 24 (mod 31) and-15 S a 15. c) a 99 (mod 4 l ) and 100 a 140. 2- Find each of these values. a) (133 mod 23 + 261 mod 23) mod 23 b) (457 mod 23 182 mod 23) mod 23