SOLUTION: f(x) is the percent incorrect on a test when there are 25 questions correct and x questions incorrect. What is the function? How many questions were incorrect if the percentage

Algebra ->  Rational-functions -> SOLUTION: f(x) is the percent incorrect on a test when there are 25 questions correct and x questions incorrect. What is the function? How many questions were incorrect if the percentage       Log On


   

Question 862428: f(x) is the percent incorrect on a test when there are 25 questions correct and x questions incorrect.
What is the function?
How many questions were incorrect if the percentage of incorrect questions is 25%?

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
f(x) is the percent incorrect on a test when there are 25 questions correct and x questions incorrect.
What is the function?
f(x) = (x)/(x+25)
---------------------------
How many questions were incorrect if the percentage of incorrect questions is 25%?
------
0.25 = x/(x+25)
x = 0.25x + 6.25
0.75x = 6.25
x = 8 1/3
----------------
Cheers,
Stan H.
----------------