SOLUTION: Hello, The formula S=4x^2-48x+220 models spending by international travelers to a certain country, in billions of dollars, x years after 2000. Use this formula to determine in whi

Algebra ->  Probability-and-statistics -> SOLUTION: Hello, The formula S=4x^2-48x+220 models spending by international travelers to a certain country, in billions of dollars, x years after 2000. Use this formula to determine in whi      Log On


   

Question 833312: Hello,
The formula S=4x^2-48x+220 models spending by international travelers to a certain country, in billions of dollars, x years after 2000. Use this formula to determine in which YEARS (if more than one please list) $80 billion dollars were spent by travelers.
Thanks in advance!
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x<=5 and
x>=7
all years except between 5 and 7