Answer:

Step-by-step explanation:
Since the foci are at(0,±c) = (0,±63) and vertices (0,±a) = (0,±91), the major axis is the y- axis. So, we have the equation in the form (with center at the origin)
.
We find the co-vertices b from b = ±√(a² - c²) where a = 91 and c = 63
b = ±√(a² - c²)
= ±√(91² - 63²)
= ±√(8281 - 3969)
= ±√4312
= ±14√22
So the equation is

The numerical value of 700 km in miles will be;
⇒ 420 miles
What is Measurement unit?
A measurement unit is a standard quality used to express a physical quantity. Also it refers to the comparison between the unknown quantity with the known quantity.
Given that;
The number is,
⇒ 700 km
And, 5 km = 3 mile
Now,
We need to change 700 km in miles by using 5 km = 3 mile.
Since, 5 km = 3 mile
So, 1 km = 3/5 mile
Hence,
700 km = 700 x 3/5 miles
= 420 miles
Thus, The numerical value of 700 km in miles will be;
⇒ 420 miles
Learn more about the measurement units visit:
brainly.com/question/174910
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