The temperature at 9 a.m. is 2 degrees. The temperature rises 3 more degrees by noon. Which expression describes the temperature at noon?
[tex]$2+3$[/tex]
[tex]$2+(-3)$[/tex]
[tex]$-2+(-3)$[/tex]
[tex]$-2+3$[/tex]
Answer (2)
The initial temperature is 2 degrees.
The temperature rises by 3 degrees.
The expression for the temperature at noon is the sum of the initial temperature and the rise in temperature.
The expression is 2 + 3 .
Explanation
Understanding the Problem The problem states that the temperature at 9 a.m. is 2 degrees. Then, the temperature rises by 3 degrees by noon. We need to find the expression that represents the temperature at noon.
Representing the Information Let's represent the initial temperature at 9 a.m. as T 1 = 2 degrees. The temperature rises by 3 degrees, which means we add 3 to the initial temperature.
Finding the Expression The temperature at noon, T 2 , can be found by adding the rise in temperature to the initial temperature: T 2 = T 1 + 3 . Substituting the value of T 1 , we get T 2 = 2 + 3 .
Final Answer Therefore, the expression that describes the temperature at noon is 2 + 3 .
Examples
Imagine you're tracking the stock market. If a stock starts at $2 and increases by $3, the expression 2 + 3 tells you the new stock price. This simple addition helps in many real-world scenarios, from calculating daily expenses to understanding changes in measurements.
The expression that describes the temperature at noon is 2 + 3 . This shows the initial temperature at 9 a.m. added to the increase in temperature. Therefore, the answer is 5 degrees at noon.
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