Find the intersection points of the parabola y=−x2−2 and the line −x+y=−4.

from equation (ii):

substitute y in (i) with y in (iii):

find y:

therefore points of intersection:

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,

"exterior angles = 360 / number of sides.

60 = 360 / sides

sides = 360 / 60

sides = 6"