Question 20 of 25beginner🔧 ApplyShort Answer2 marks

Imagine you're in a place where the temperature drops by 5°C each hour. If the temperature is currently at 8°C, write an expression which denotes the temperature after 4 hours.

Correct Answer

Step 1: Temperature decrease per hour = −5°C Step 2: Number of hours = 4 Step 3: Total decrease = 4 × (−5) = −20°C Step 4: Expression: 8 + 4 × (−5) or 8 − 4×54 \times 5 Step 5: Final temperature = 8 + (−20) = −12°C

Answer: The expression is 8 + 4 × (−5) or 8 − 4×54 \times 5. The temperature after 4 hours will be −12°C.

Exercise: Figure it Out (Section 5) | Q: 8 | (Page Page 20)
For More Understanding

Explanation

The chapter explains that temperature decrease can be modeled using negative integers. The temperature drops by 5°C each hour, which can be represented as −5°C per hour. After 4 hours, the total decrease is 4 × (−5) = −20°C. Starting from 8°C, the final temperature is 8 + (−20) = −12°C.

Solution Steps

  1. Step 1: Temperature decrease per hour = −5°C

  2. Step 2: Number of hours = 4

  3. Step 3: Total decrease = 4 × (−5) = −20°C

  4. Step 4: Expression: 8 + 4 × (−5)

  5. Step 5: Final temperature = 8 + (−20) = −12°C

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