Question 1170419
a. The narrowest point occurs when the hyperbola crosses the x-axis,
i.e. y= 0. Setting y=0, we have x^2 = 25 -> x = +-5.
Thus the width = 10
b. Set y = 225 and solve for x:
x^2/25 = 1 + 225^2/100 -> x = +-112.61 -> width = 225.22