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A number with a negative exponent should be treated as the reciprocal of that same number with the analogous positive exponent. For example, 42 = 16, but 4-2 = 1/42 = 1/16.
A positive exponent in the denominator of a fraction, with one in the numerator. For example: 4-2 = 1/42 (Formatting difficult: read fraction as "one over four squared")
42
The expression is 42/23
The expression for this type of problem is 6 + (42 / 21). Then, evaluate that by the order of operations to obtain: 6 + 2 = 8