simplify and Express the results in power notation with positive exponent a)(7‐⁹÷7-¹²)×7‐⁶
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Step-by-step explanation:
(7⁻⁹÷7⁻¹²)×7⁻⁶
={7⁻⁹⁻(⁻¹²)}×7⁻⁶
=7⁻⁹⁺¹²×7⁻⁶
=7³×7⁻⁶
=7³⁺(⁻⁶)=7³⁻⁶=7⁻³=1/7³=1/21
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