Answer:

Step-by-step explanation:
The directrix y=-6 is parallel to the x axes, so parabola has equation of the form

where
is the vertex of parabola and p is parabola's parameter.
By the definition,
is the distance from the vertex to the directrix, so

Hence, the equation of parabola is

See attached diagram for the graph of parabola and its directrix.
In vertex form this equation is

Answer:
okay
Step-by-step explanation:
2a + 8a simplified is 10a
Answer:
A
Step-by-step explanation:
1) Multiply 0.75 for m and -250
162.5 + 0.75m - 187.5
2) sum the therms without m
0.75m - 25