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To solve the expression using the properties of exponents, we can first combine the bases of the two exponentials since they are the same. When we multiply two numbers with the same base, the exponents are added. Therefore:
13^(-5) ⋅ 13^(-11) = 13^(-5-11)
= 13^(-16)
To convert the expression to positive exponents, we can use the property that a negative exponent is equal to the reciprocal of the positive exponent. Therefore:
13^(-16) = 1 / 13^(16)
So the equivalent expression with only positive exponents is 1 / 13^(16).