Apply the property of negative integer exponents to rewrite 15-^38 as an expression with positive exponents only.
To apply the property of negative integer exponents, we can rewrite 15^-38 as its reciprocal with the exponent changed to a positive number.
The property states that for any nonzero number "a" and integer "n", a^(-n) = 1/a^n.
Therefore, 15^-38 can be rewritten as 1/15^38.