2-³ can be simplified using the rule that states that a negative exponent is equivalent to the reciprocal of the positive exponent. Therefore:
2-³ = 1 / 2³
2³ means 2 * 2 * 2, which is equal to 8. So:
2-³ = 1 / 8
Therefore, the value of the expression 2-³ is 1/8 or 0.125.
Hope this helps!