Arithmetic Operator Puzzles

#4513: 9 _ 8 _ 2 _ 4 = 5 easy #4514: 9 _ 8 _ 2 _ 3 = -3 medium #4515: 9 _ 8 _ 2 _ 6 = 6 easy #4516: 9 _ 8 _ 3 _ 4 = 15 hard #4517: 9 _ 8 _ 3 _ 6 = 13 hard #4518: 9 _ 8 _ 3 _ 2 = -3 medium #4519: 9 _ 8 _ 3 _ 4 = 3 easy #4520: 9 _ 8 _ 3 _ 6 = 5 easy #4521: 9 _ 8 _ 3 _ 6 = -7 hard #4522: 9 _ 8 _ 3 _ 4 = 20 hard #4523: 9 _ 8 _ 3 _ 4 = 6 easy #4524: 9 _ 8 _ 3 _ 6 = 18 hard #4525: 9 _ 8 _ 3 _ 7 = 17 hard #4526: 9 _ 8 _ 3 _ 8 = 16 hard #4527: 9 _ 8 _ 3 _ 9 = 15 hard #4528: 9 _ 8 _ 4 _ 5 = 19 hard #4529: 9 _ 8 _ 4 _ 3 = 3 easy #4530: 9 _ 8 _ 4 _ 5 = -1 easy #4531: 9 _ 8 _ 4 _ 6 = -3 medium #4532: 9 _ 8 _ 4 _ 7 = -5 medium #4533: 9 _ 8 _ 4 _ 8 = -7 hard #4534: 9 _ 8 _ 4 _ 9 = -9 hard #4535: 9 _ 8 _ 4 _ 1 = 19 hard #4536: 9 _ 8 _ 4 _ 1 = 17 hard #4537: 9 _ 8 _ 4 _ 2 = 20 hard #4538: 9 _ 8 _ 4 _ 2 = 16 hard #4539: 9 _ 8 _ 4 _ 3 = 6 easy #4540: 9 _ 8 _ 4 _ 4 = 14 hard #4541: 9 _ 8 _ 4 _ 5 = 13 hard #4542: 9 _ 8 _ 4 _ 6 = 12 hard #4543: 9 _ 8 _ 4 _ 7 = 11 hard #4544: 9 _ 8 _ 4 _ 8 = 10 medium #4545: 9 _ 8 _ 4 _ 9 = 9 medium #4546: 9 _ 8 _ 5 _ 4 = 19 hard #4547: 9 _ 8 _ 5 _ 4 = -1 easy #4548: 9 _ 8 _ 6 _ 3 = 13 hard #4549: 9 _ 8 _ 6 _ 3 = -7 hard #4550: 9 _ 8 _ 6 _ 4 = -3 medium #4551: 9 _ 8 _ 6 _ 3 = 5 easy #4552: 9 _ 8 _ 6 _ 9 = -3 medium #4553: 9 _ 8 _ 6 _ 1 = 13 hard #4554: 9 _ 8 _ 6 _ 2 = 10 medium #4555: 9 _ 8 _ 6 _ 2 = 6 easy #4556: 9 _ 8 _ 6 _ 3 = 9 medium #4557: 9 _ 8 _ 6 _ 4 = 16 hard #4558: 9 _ 8 _ 6 _ 4 = 8 medium #4559: 9 _ 8 _ 6 _ 5 = 17 hard #4560: 9 _ 8 _ 6 _ 5 = 7 medium