Find the actual length. Scale length is 9 cm. Scale is 1 cm = 7.5 m.

67.5 meters

Step by step explanation

I think you meant the scale drawing is 9 cm so all you have to do is multiple 9 times 7.5 because 1 cm is 7.5 so if you multiple 9 times 7.5 you get how much it is in real life which is 67.5

Step-by-step explanation:

we know that

The ellipse has directrices at > given

The directrices has equation:

where e is the eccentricity of the ellipse.

so

> equation A

Remember that the foci are given by:

In this problem

The foci are at (0,2) and (0,-2)

so

> equation B

Solve the system of equations A and B

substitute equation A in equation B

Find the value of a

We know,

Substituting the values, we get

The equation of the ellipse is given by:

we have

substitute

therefore

x squared over 4 plus y squared over 8 equals 1