1. **Rounding 7.345 to one decimal place** The problem asks to round the number 7.345 to one decimal place. 2. **Rule for rounding to one decimal place:** Look at the second decimal digit (the hundredths place). - If it is 5 or greater, round the first decimal digit up by 1. - If it is less than 5, keep the first decimal digit the same. 3. For 7.345, the first decimal digit is 3, and the second decimal digit is 4. 4. Since 4 is less than 5, we keep the first decimal digit as 3. 5. Therefore, 7.345 rounded to one decimal place is **7.3**. 6. **Solving the equation 15 - x = 0** 7. The equation is 15 - x = 0. 8. To solve for x, add x to both sides: 15 = x. 9. So, the solution is **x = 15**. **Final answers:** - Question 11: 7.3 (option b) - Question 12: x = 15 (option a)