1. **State the problem:** Solve the one-step linear equation $$-2.9 = \frac{f}{4}$$ for the variable $f$. 2. **Formula and rule:** To isolate $f$, multiply both sides of the equation by 4, because $f$ is divided by 4. 3. **Multiply both sides by 4:** $$4 \times -2.9 = 4 \times \frac{f}{4}$$ 4. **Cancel common factors:** $$4 \times -2.9 = \cancel{4} \times \frac{f}{\cancel{4}}$$ 5. **Simplify:** $$4 \times -2.9 = f$$ 6. **Calculate:** $$f = -11.6$$ **Final answer:** $$f = -11.6$$