the length of z is C. 15 cm
i think it would be your first choice
Answer : D

The denominators are same
So we combine the numerators

To remove parenthesis we distribute negative sign inside the second parenthesis



Morgan made a mistake. He forgot to distribute the negative sign
Morgan forgot to distribute the negative sign to two of the terms 2t and 2 inside second parenthesis
There is two possible conic section that can be formed when the plane intersects the vertical axis, a circle, and an ellipse. Cutting one nappe of double napped cone perpendicular to the vertical axis means the cut is straight across the cone making a right angle. The conic section formed would be a circle.