**Answer:**

p=14

**Step-by-step explanation:**

5p/14=5

5p=5x14

5p=70

p=70/5

p=14

**Answer: y = -2x² + 920x - 84168**

suppose: the equation of the parabola is y = ax² + bx + c

because the parabola passes through (126,0); (134,3200); (334,0)

=> we have the equations:

126².a + 126b + c = 0

134².a + 134b + c = 3200

334². a + 334b + c = 0

⇒ a = -2

b = 920

c = -84168

=> the equation of the parabola is y = -2x² + 920x - 84168

**Step-by-step explanation:**