Express the answers to the following calculations in scientific notation:
(a) 145.75 + (2.3 × 10-1)
(b) 79,500 ÷ (2.5 × 102)
(c) (7.0 × 10-3) − (8.0 × 10-4)
(d) (1.0 × 104) × (9.9 × 106)
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