To determine what Isaiah can afford, we need to calculate the total cost for each option based on the prices given for the bowling alleys.
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4 games at Bowling Alley B: \[ \text{Total Cost} = 4 \text{ games} \times 5.25 = 21.00 \]
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5 games at Bowling Alley C: \[ \text{Total Cost} = 5 \text{ games} \times 3.75 = 18.75 \]
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5 games at Bowling Alley A: \[ \text{Total Cost} = 5 \text{ games} \times 4.25 = 21.25 \]
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6 games at Bowling Alley D: \[ \text{Total Cost} = 6 \text{ games} \times 3.50 = 21.00 \]
Now, compare each total cost to Isaiah's budget of $20:
- Bowling Alley B: $21.00 (not affordable)
- Bowling Alley C: $18.75 (affordable)
- Bowling Alley A: $21.25 (not affordable)
- Bowling Alley D: $21.00 (not affordable)
Thus, the only option Isaiah can afford is 5 games at Bowling Alley C for $18.75.