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True or false.

We cannot add or subtract terms with different exponents.

$(a+b)^5=a^5+b^5$ is an application of the fourth law of exponents.

If $x \not= 0\text{,}$ then $\dfrac{k}{x^{-n}} = kx^n\text{.}$

$(x^2)^{-3} = (x^{-2})^3$ because $\dfrac{1}{x^2 \cdot x^2 \cdot x^2} = \left(\dfrac{1}{x^2}\right)\left(\dfrac{1}{x^2}\right)\left(\dfrac{1}{x^2}\right)$ .

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