1. **State the problem:** Solve for $m2$ in the equation $2.33=\frac{-1}{m2}$. 2. **Formula and rules:** The equation is a simple rational equation where $m2$ is in the denominator. To solve for $m2$, multiply both sides by $m2$ and then divide both sides by 2.33. 3. **Step-by-step solution:** Multiply both sides by $m2$: $$2.33 \times m2 = -1$$ Divide both sides by 2.33: $$m2 = \frac{-1}{2.33}$$ 4. **Simplify the fraction:** Calculate the decimal value: $$m2 \approx -0.429$$ 5. **Answer:** The value of $m2$ is approximately $-0.429$.