\[ 210 = \frac{10}{2}(5 + l) \]

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• \[ s = 0 + \frac{1}{2} \times 2 \times 10^2 \]
• \[ s = \frac{1}{2} \times 2 \times 100 = 100 \] meters.
• \[ S_n = \frac{n}{2}(a + l) \]
• \[ 210 = 5(5 + l) \]
• \[ 42 = 5 + l \]
• \[ l = 37 \]

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