1. **State the problem:** Calculate the value of $$(29.29 \times 10^8) - (19.77 \times 10^8)$$. 2. **Formula and rules:** When subtracting numbers with the same power of 10, subtract the coefficients and keep the power of 10 the same. 3. **Intermediate work:** $$29.29 \times 10^8 - 19.77 \times 10^8 = (29.29 - 19.77) \times 10^8$$ $$= 9.52 \times 10^8$$ 4. **Explanation:** We simply subtract the numbers 29.29 and 19.77 because both terms are multiplied by the same $10^8$. The result is then multiplied by $10^8$. 5. **Final answer:** $$9.52 \times 10^8$$