1. The problem asks which graph represents a linear function increasing at a constant rate. 2. A linear function increasing at a constant rate has a positive slope and is a straight line. 3. From the descriptions: - Graph A: linear, positive slope, passes through origin. - Graph C: linear, negative slope. - Graph B: nonlinear curve. - Graph D: linear, positive slope, starts near (-3,0). 4. Both Graph A and Graph D show linear functions with positive slopes, so both increase at a constant rate. 5. Since Graph A passes through the origin and Graph D starts near (-3,0), both are valid linear increasing functions. 6. The problem likely expects the simplest example, which is Graph A. 7. Therefore, the graph representing a linear function increasing at a constant rate is Graph A. 8. Next problem: Find the sum of $3 \times 10^{6}$ and $3 \times 10^{5}$. 9. Write the numbers: $$3 \times 10^{6} = 3,000,000$$ $$3 \times 10^{5} = 300,000$$ 10. Add them: $$3,000,000 + 300,000 = 3,300,000$$ 11. Express the sum in scientific notation: $$3,300,000 = 3.3 \times 10^{6}$$ 12. Final answer: $3.3 \times 10^{6}$.