The atmospheric pressure at altitude h (kilometers) for 11 ≤ h ≤ 25 is approximately                                                                                                                   P(h) = 128e- 0· 157h kilopascals                                                                (a) Estimate ∆P at h = 20 when ∆h = 0.5. (b) Compute the actual change, and compute the percentage error in the Linear Approximation.

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