Arithmetic Operator Puzzles

#913: 2 _ 8 _ 4 _ 8 = -7 medium #914: 2 _ 8 _ 4 _ 9 = 10 medium #915: 2 _ 8 _ 4 _ 9 = -8 hard #916: 2 _ 8 _ 5 _ 4 = 12 medium #917: 2 _ 8 _ 5 _ 4 = -8 medium #918: 2 _ 8 _ 5 _ 5 = 17 hard #919: 2 _ 8 _ 5 _ 5 = 15 hard #920: 2 _ 8 _ 5 _ 4 = 20 hard #921: 2 _ 8 _ 5 _ 4 = 5 easy #922: 2 _ 8 _ 6 _ 3 = 6 easy #923: 2 _ 8 _ 6 _ 9 = 14 hard #924: 2 _ 8 _ 6 _ 2 = 19 hard #925: 2 _ 8 _ 6 _ 6 = 17 hard #926: 2 _ 8 _ 6 _ 3 = 14 hard #927: 2 _ 8 _ 6 _ 6 = 15 hard #928: 2 _ 8 _ 6 _ 2 = 3 easy #929: 2 _ 8 _ 7 _ 4 = 16 hard #930: 2 _ 8 _ 7 _ 7 = 17 hard #931: 2 _ 8 _ 7 _ 7 = 15 hard #932: 2 _ 8 _ 8 _ 8 = 17 hard #933: 2 _ 8 _ 8 _ 2 = 12 medium #934: 2 _ 8 _ 8 _ 8 = 15 hard #935: 2 _ 8 _ 9 _ 4 = 20 hard #936: 2 _ 8 _ 9 _ 6 = 14 hard #937: 2 _ 8 _ 9 _ 3 = 19 hard #938: 2 _ 8 _ 9 _ 9 = 17 hard #939: 2 _ 8 _ 9 _ 9 = 15 hard #940: 2 _ 8 _ 9 _ 4 = 9 medium #941: 2 _ 9 _ 2 _ 3 = 8 medium #942: 2 _ 9 _ 2 _ 3 = -4 medium #943: 2 _ 9 _ 2 _ 2 = 19 hard #944: 2 _ 9 _ 2 _ 2 = 17 hard #945: 2 _ 9 _ 2 _ 3 = 3 easy #946: 2 _ 9 _ 3 _ 4 = 14 hard #947: 2 _ 9 _ 3 _ 5 = 17 hard #948: 2 _ 9 _ 3 _ 2 = -4 medium #949: 2 _ 9 _ 3 _ 3 = 19 hard #950: 2 _ 9 _ 3 _ 2 = 4 easy #951: 2 _ 9 _ 3 _ 4 = 2 easy #952: 2 _ 9 _ 3 _ 5 = 11 hard #953: 2 _ 9 _ 3 _ 6 = 12 hard #954: 2 _ 9 _ 3 _ 6 = 1 easy #955: 2 _ 9 _ 3 _ 7 = 13 hard #956: 2 _ 9 _ 3 _ 7 = -1 easy #957: 2 _ 9 _ 3 _ 8 = 14 hard #958: 2 _ 9 _ 3 _ 9 = 15 hard #959: 2 _ 9 _ 3 _ 9 = -3 medium #960: 2 _ 9 _ 3 _ 6 = 4 easy