The best fit line given is:
P= -0.79t+20.95
P is the profit or loss
t is the time in years after 1965.
So, 1980-1965 = 15 => t=15
P= -0.79*15 +20.95
P= -11.85 + 20.95
P= 9,1
$9,1 thousands of dollars
1.6m questions
2.0m answers