exam Maths Puzzle Numerical Ability

Find the area of triangle ABC if A=56 degrees, b=20 ft, and c=12 feet. Round to the nearest tenth.

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exam Other Question

x3-4x+7x2+3+2x write in exponential form the 4th root of (16^3 * a^-2)/b^6

so far I got that it has simplified to 16^3/4 * a^-1/2 * b^ 2/3, but I am not sure if the b^2/3 is right.