
CAROLYN H. answered 10/10/16
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A is 1.7x105 and B is 9.6x104 and C is 8.1x104. You can combine them when A is written as 17x104 (same value as 1.7x105). Total mass is (17+9.6+8.1)x104 = 34.7x104 = 3.47x105 or 347,000 (answer a). The difference of A (17x104) and B (9.6x104) is (17-9.6)x104 = 7.4x104 or 74,000 (answer b). The difference of B and C is
(9.6-8.1)x104 = 1.5x104 or 15,000 (answer c).
(9.6-8.1)x104 = 1.5x104 or 15,000 (answer c).