What is the average rate of change from x = 1 to x = 3?

-4

-2

2

4

Question

What is the average rate of change from x = 1 to x = 3? 

 -4

 -2

 2

 4

anonymous · Answer

@ganeshie8 @satellite73 2??

ganeshie8 · Answer

average rate of change of whom ?

anonymous · Answer

why can't i post the graph

anonymous · Answer

when i attach, it won't let me press the post button

ganeshie8 · Answer

Oh, refresh the page and try again

anonymous · Answer

attachment

anonymous · Answer

yep that worked

ganeshie8 · Answer

good :) 
average rate of change between two points is simply the slope of line that joins them

anonymous · Answer

ok thanks can you help with 1 more

anonymous · Answer

y = -1(x - 4)^2 + 1

 y = -1(x + 1)^2 + 4

 y = 1(x + 1)^2 - 4

 y = 1(x + 4)^2 - 1

anonymous · Answer

what is the equation of the graph

I don't know how to do this one

ganeshie8 · Answer

the parabola is opening UP, 
so the value of "$\large a$" has to be positive in  :
$$\large y = a(x-h)^2+k$$

ganeshie8 · Answer

in light of above information, which two options can you eliminate ?

anonymous · Answer

makes sense, so a and b are out

ganeshie8 · Answer

Yes! look at the graph, whats the vertex point ?

anonymous · Answer

(-1,-4)

ganeshie8 · Answer

perfect!
so  $\large h = -1$ and   $\large k = -4$

anonymous · Answer

so c?

ganeshie8 · Answer

Correct!

anonymous · Answer

ok thanks so much, those were the two i wasn't sure about. you make everything seem easy!

anonymous · Answer

they were right, thanks again ^_^

ganeshie8 · Answer

np :) yw !