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Answer:a. (5 * 9) * (10^3 * 10^7)
45 * 10^3+7
45 * 10^10 = 4.5 * 10^11
b. 7 * 10^5/2 * 10^2
7 * 10^3/2
7 * 1000/2
7 * 500 = 3500 or 3.5 * 10^3
Step-by-step explanation: