The point in a lunar orbit nearest the surface of the moon is called perilune and the point farthest from the surface is called apolune.The Apollo 11 spacecraft was placed in an elliptical lunar orbit with perilune altitude 
and apolune altitude 
(above the moon).Find an equation of 
this ellipse if the radius of the moon is and the center of the moon is at one focus.
Definitions:
Debt-Equity Ratio
A ratio calculating the balance of debt and equity utilized for financing a company's assets.
Risk-Free Rate
A hypothetical profit rate from a risk-free investment, usually shown by the earnings on state-backed securities.
Yield-to-Maturity
The total return anticipated on a bond if the bond is held until its maturity date, considering all interest payments and the repayment of principal.
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