Need help !! 25 points
1 answer:
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Answer:
Up
Step-by-step explanation:
Y= 1x^2 + 3x + 9
Y= Ax^2 + Bx + C
To determine which way a parabola opens just look at the coefficient (the number) of the x^2 - Always use the coefficient that is beside the x^2
So, if the coefficient A is positive the parabola is opening upward
if the coefficient A is negative the parabola is opening downward
A; rate of change is the same as slope, so, using the slope formula, 
, where 
is the slope and 
, 
, 
, and 
are the 
and 
values.
Plug in
points for and , water level being the and time being the since we're looking for the answer in ft/hr-- you can choose any two, but from the same row.
ft/hr
Plug in