Question 664326
the ellipse has a horizontal axis of the length 12 and vertical axis of the length 18.what is the equation.
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Coordinates of the center are needed to solve this problem. I will assume they are (0,0)
Standard form of an equation for an ellipse with vertical major axis: 
{{{(x-h)^2/b^2+(y-k)^2/a^2+1}}}, a>b, (h,k)=(x,y) coordinates of center.
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given length of vertical major axis=18=2a
a=9
a^2=81
given length of minor axis=12=2b
b=6
b^2=36
equation:
{{{x^2/36+y^2/81+1}}}