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Section 7.4

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1. (b)

Planet Aphelion
Mercury 0.47
Venus 0.73
Earth 1.02
Mars 1.65
Jupiter 5.47
Saturn 10.17
Uranus 20.22
Neptune 30.40
Pluto 46.67

3. The distance from the sun to Halley’s comet at aphelion is 35.2 astronomical units.

5. (a) 0.9996x^2 + y^2 + 0.04x - 0.9992 = 0

(b) 583 million miles

(c) 66,500 miles per hour

7. (a) y_1(t) = e^t , y_2(t) = e^{-t}

(c) y(t) = 3e^t - e^{-t}

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