exam Maths Puzzle Numerical Ability

please help me to solve this equation? 7^77-77^67?

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exam Other Question

Describe the differences in the graphs of |X|>A and |X| less than A, where A is a positive real number A field Microphone has a parabolic cross section and is 18 inches deep. The focus is 4 inches from the vertex. Find the width of the microphone.