Answer:
Step-by-step explanation:
The directrix of the parabola is the horizontal line with the eqaution 
The focus of the parabola is at point (-4,10), than the axis of symmetry of the parabola is the perpendicular line to the directrix passing through the focus. Its equation is 
The distance between the directrix and the focus is 
so 
and the vertex is at point 
Parabola goes in positive y-direction, hence its equation is
where 
is the vertex, so the equation of this parabola is
4,230, which is solved by multiplying both the questions and the students
Answer: x=13
Step-by-step explanation:
Because the cos theta < 0 then theta must be an obtuse angle
so a^2 + b^2 < a^2
C
