To determine the value of \( b \) given \( n = 56 \) and \( a = 70 \), we need a mathematical context or formula that relates \( n \), \( a \), and \( b \). Since no specific formula is provided in your question, we cannot directly calculate \( b \).
However, by examining the provided responses, we can look for a common relationship or average between \( n \) and \( a \):
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Calculate the average of \( n \) and \( a \): \[ \text{Average} = \frac{n + a}{2} = \frac{56 + 70}{2} = \frac{126}{2} = 63 \]
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Check for the closest options provided:
- b = 64.8
- b = 45
- b = 52.5
- b = 42
The closest number to 63 is b = 64.8.
Assuming the question is looking for a logical choice based on those values and their proximity, the likely answer would be b = 64.8.
If there is a specific formula or calculation you have in mind that directly relates \( n \), \( a \), and \( b \), please provide that, and I would be happy to assist further!