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Let's work through each problem by rewriting the expressions with positive exponents.

1. \( b^{-4} \)
   \[
   b^{-4} = \frac{1}{b^4}
   \]

2. \( c^{-1} \)
   \[
   c^{-1} = \frac{1}{c}
   \]

3. \( w^{-3}z^{-2} \)
   \[
   w^{-3}z^{-2} = \frac{1}{w^3z^2}
   \]

4. \( n^2m^{-2}z^0 \)
   \[
   z^0 = 1 \quad \text{(since any non-zero number raised to the power of 0 is 1)}
   \]
   \[
   n^2m^{-2}z^0 = n^2 \cdot \frac{1}{m^2} \cdot 1 = \frac{n^2}{m^2}
   \]

5. \( de^{-5}f \)
   \[
   de^{-5}f = \frac{df}{e^5}
   \]

6. \( \frac{x^7}{(x-y)^{-2}} \)
   \[
   \frac{x^7}{(x-y)^{-2}} = x^7 \cdot (x-y)^2 = x^7(x-y)^2
   \]

7. \( \frac{(a^4b^{-6}c^9)}{(d^{-2}e^3)} \)
   \[
   \frac{(a^4b^{-6}c^9)}{(d^{-2}e^3)} = \frac{a^4 \cdot c^9}{b^6} \cdot \frac{d^2}{e^3} = \frac{a^4 c^9 d^2}{b^6 e^3}
   \]

8. \( 14c^0 \)
   \[
   14c^0 = 14 \cdot 1 = 14
   \]

9. \( \frac{10}{y^2} \)
   This expression already has positive exponents.

10. \( \frac{2}{(a-b+c)^{-2}} \)
    \[
    \frac{2}{(a-b+c)^{-2}} = 2 \cdot (a-b+c)^2 = 2(a-b+c)^2
    \]

Let me know if you have any questions or would like further details on any of the steps. 

Here are some related questions for practice:

1. How would you simplify \(\frac{x^{-2}y^3}{z^{-4}}\)?
2. Can you rewrite \((ab^{-1}c^{-3})^{-2}\) with positive exponents?
3. What is the positive exponent form of \( p^{-5}q^{-4}r^0 \)?
4. Simplify the expression \(\frac{a^0 b^2}{c^{-3} d^{-4}}\) using positive exponents.
5. How would you express \(\left(\frac{x^{-2}}{y^{-3}}\right)^{-1}\) with positive exponents?

**Tip:** Always remember that any non-zero number raised to the power of 0 is equal to 1.

Learn how to simplify expressions with negative and fractional exponents by converting them into positive exponents. This tutorial covers basic exponent rules and techniques for handling various exponent forms.

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