Problem 2 · Move along the number line · 3 points
Made by AI and not reviewed by a real person.
In the morning the temperature was −7 °C. By noon it had risen by 12 degrees. What was the temperature at noon?
- 5 °C
- 19 °C
- −19 °C
- 4 °C
- −5 °C
Show a hint
- Use 0 °C as a checkpoint. Work out whether the rise reaches it, and then consider what happens to any part of the rise left over.
- How many degrees does it take to rise from −7 °C to 0 °C? Compare that with the total rise of 12 degrees.
Show the answer and solution
Answer: A — 5 °C
It takes a rise of 7 degrees to go from −7 °C to 0 °C. That leaves 12 − 7 = 5 degrees of the rise, so the temperature at noon was 5 °C. The trap in choosing −5 °C is keeping the negative sign even though the rise carried the temperature past zero.