1. The problem asks: What percent of 70 is 3.5? 2. To find what percent one number is of another, use the formula: $$\text{Percent} = \left(\frac{\text{Part}}{\text{Whole}}\right) \times 100$$ 3. Here, the "Part" is 3.5 and the "Whole" is 70. 4. Substitute the values into the formula: $$\text{Percent} = \left(\frac{3.5}{70}\right) \times 100$$ 5. Calculate the fraction: $$\frac{3.5}{70} = 0.05$$ 6. Multiply by 100 to convert to a percentage: $$0.05 \times 100 = 5$$ 7. So, 3.5 is 5% of 70. 8. To input this on a TI-30X IIS calculator: - Press 3.5 - Press the division key ÷ - Press 70 - Press the equals key = - The display shows 0.05 - Then multiply by 100: press × 100 = - The display shows 5 Final answer: 5% (option d)