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You simply do all the calculations. Remember that powers must be calculated before multiplications (unless there is a more complicated expression in the exponent, in which case this expression must be evaluated first).
To solve 8 to the power of 2 to the power of 5, you first calculate 8 to the power of 2, which is 64. Then, you raise 64 to the power of 5, which equals 1,073,741,824. This can be calculated by multiplying 64 by itself 5 times.
8 1/3 = ab^-1, 1.8 =ab^2
(3x - 7)(2x + 9) = 0 x = 7/3 or -9/2