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The lowest temperature of the year in Alaska was [tex]-15^{\circ} F[/tex], while the highest temperature of the year was [tex]83^{\circ} F[/tex]. Which expression will calculate the difference between the two temperatures?

A. [tex]|83-15|[/tex]
B. [tex]|-15+83|[/tex]
C. [tex]-15-83[/tex]
D. [tex]|83-(-15)|[/tex]

Answer :

To find the difference between the lowest and highest temperatures, we need to calculate how many degrees separate them. The lowest temperature is [tex]\(-15^{\circ} F\)[/tex], and the highest is [tex]\(83^{\circ} F\)[/tex].

To find the difference between two values, we can use subtraction. Since the temperatures have different signs, we use the formula for absolute difference, which is:

[tex]\[ \text{Difference} = | \text{highest temperature} - \text{lowest temperature} | \][/tex]

Substituting the given temperatures into this formula, we get:

[tex]\[ \text{Difference} = | 83 - (-15) | \][/tex]

When we subtract a negative number, it is the same as adding its positive counterpart. Therefore, the expression becomes:

[tex]\[ | 83 + 15 | \][/tex]

Now, let's calculate:

[tex]\[ 83 + 15 = 98 \][/tex]

Taking the absolute value (which is simply the number itself since it's positive):

[tex]\[ |98| = 98 \][/tex]

So, the difference between the highest and lowest temperatures is [tex]\(98^{\circ} F\)[/tex].

Thus, the correct expression to find the difference is:

(D) [tex]\(|83 - (-15)|\)[/tex]

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