Interpret Quadratic Functions

Question

anonymous · Answer

attachment

mathmate · Answer

Hints:
|dw:1420629144215:dw|

anonymous · Answer

so the line of symmetry would be 2.5 secs

anonymous · Answer

i'm still confused i need more of an explanation

mathmath333 · Answer

try this http://www.mathsisfun.com/geometry/symmetry-line-plane-shapes.html

butterflydreamer · Answer

@Starr_DynastyT  yes you're correct :)

anonymous · Answer

for the first one @butterflydreamer

butterflydreamer · Answer

yepp

butterflydreamer · Answer

do you understand the second question?

butterflydreamer · Answer

Basically what the second question is asking you is 
At which two times on the graph  is the height of the projectile = 15 feet.
So you should think of it as when you throw a ball in the air.
When you throw a ball in the air, it goes up and then it has to come down again right? 
Do you kinda understand what i mean? @Starr_DynastyT

anonymous · Answer

in a way  yes i do @butterflydreamer

butterflydreamer · Answer

so what do you think the answer is? :)