51
After searching close to
x
= 18, the point (18, 324) appears to
be the vertex of the parabola since it appears to be the turning
point of the set of points of this function. To search closer to
x
= 18, change the Step value to smaller and smaller values
to see points closer to (18, 324).
³
Problem
A charity collected $3,600 to help support a local food kitchen.
$450 will be given to the food kitchen every month until the
funds run out. How many months will the charity support the
kitchen?
Reminder: If
x
= months and
y
= money left, then
y
= 3600
N
450
x.
The support of $450 per month will last for 8 months since
y
(8) = 3600 - 450(8) = 0 as shown in the table of values.
<
I
2
-
3600
U
450
z
<
0
$
1
$"
<
$
<
Input each guess and press
<
.
Calculate the value of
f(8)
on the
Home screen.
% s
I
1
Selects
f(
8
)
<
