Answer
$P(0)=-100,$
The airline had a loss of $\$ 100$ million in 2005.
$P(4)=-400,$
The airline had a loss of $\$ 400$ million in 2009.
$P(1.5)=400$
In a year that started on July 1st, 2006, , the airline had a profit of $\$ 400$ million.
Work Step by Step
The graph contains points ($t,\ P(t)$)
Reading the graph we estimate that the points
(0, $-100$) , ($4,-400$), and ($1.5,400$) are ON THE GRAPH.
So,
$P(0)=-100,$
$P(4)=-400,$
$P(1.5)=400$
t represents years after 2005,
P(t) is profit or loss in millions od dollars (negative income = loss)
$P(0)=-100,$
The airline had a loss of $\$ 100$ million in 2005.
$P(4)=-400,$
The airline had a loss of $\$ 400$ million in 2009.
$P(1.5)=400$
"1.5 years after 2005" is 1 full year + half a year after 2005,
in other words, midway through the year 2007!
(To express this in full completed years,
midway through 2007 = the year of time that started on July 1st, 2006)
Interpretation:
Midway through the year 2007, the airline had a profit of $\$ 400$ million
or
In a year that started on July 1st, 2006, , the airline had a profit of $\$ 400$ million.
