To calculate this expression, we need to apply the rule for subtracting fractions:
7/4 - (-1/2) = 7/4 + 1/2
Since the denominators are different, we need to find a common denominator. The least common denominator for 4 and 2 is 4. We'll convert both fractions to have a denominator of 4:
7/4 = 7/4 * 1/1 = 7/4
1/2 = 1/2 * 2/2 = 2/4
Now the expression becomes:
7/4 + 2/4 = (7 + 2)/4
The sum of 7 and 2 is 9:
9/4
So, 7/4 - (-1/2) simplifies to 9/4.
7/4 - (-1/2)?
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