1: Satellites can be put into elliptical orbits if they need only sometimes to be in high- or low-earth orbit, thus avoiding the need for propulsion and navigation in low-earth orbit and the expense of launching into high-earth orbit. Suppose a satellite is in an elliptical orbit, with a = 4429 and b = 4417 (a and b in the standard formula for an ellipse), and with the center of the Earth being at one of the foci of the ellipse. Assuming the Earth has a radius of about 3960 miles, find the lowest altitude of the satellite above the Earth when it's on the major axis of the elliptical orbit. the lowest altitude above the earth is how many miles above the surface of the earth?

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