Question 178650
Amtrak's annual passenger revenue for the years 1985-1995 is modeled approximately by the formula R=-60/x-11/+962 where R is the annual revenue in millions of dollars and x is the number of years since January 1, 1980 
:
Assume the equation is:
R = -60|x-11| + 962
:
In what years was the passenger revenue $722 million?
;
Replace R with 722
:
-60|x-11| + 962 = 722
-60|x-11| = 722 - 962
-60|x-11| = -240
:
Remove the absolutes and solve two equation (we will have two solutions):
-60x + 660 = -240
-60x = -240 - 660
-60x = -900
x = {{{(-900)/(-60)}}}
x = +15 years or 1995
and
-60x + 660 = +240
-60x = 240 - 660
-60x = -420
x = {{{(-420)/(-60)}}}
x = +7 years or 1987