exam Maths Puzzle Numerical Ability

Please help me solve this equation: log2((x^2)+7)=4 (the first 2 is supposed to be small and at the bottom)

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(6m^0)(3^-1m^2n^-4) I got this incorrect on homework and need to correct it. I do not understand how to solve the equation. how do i solve this equation? Determine BC if AC = 4.2 ft and AB = 9.1 ft. Round to the nearest tenth.