Use your calculator to determine the answer to the following calculation: 1.0×10−154.2×10−7

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Use your calculator to determine the answer to the following calculation: 1.0×10−154.2×10−7

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The way to do this is by using PEMDAS. P (brackets) E (exponents) M (multiplication) D (division) A (Addition) S (subtraction). The answer would be -1539