SOLUTION: Joe has a collection of nickels and dimes that is worth $6.05. If the number of dimes was doubled and number of nickels was decreaseed by 10, the value of the coins would be $9.85.

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Question 198830: Joe has a collection of nickels and dimes that is worth $6.05. If the number of dimes was doubled and number of nickels was decreaseed by 10, the value of the coins would be $9.85. how many dimes does he have?
f(x) = ax^2 + bx + c = 0
using this formula I cannot figure the answer out. please help.
Found 2 solutions by jim_thompson5910, solver91311:
Answer by jim_thompson5910(28593) About Me  (Show Source):
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Answer by solver91311(16877) About Me  (Show Source):
You can put this solution on YOUR website!


I already answered this question -- probably for you (and I say that because you are off on the same wrong tangent as before).



is the standard form of the quadratic function.



is the general form of the quadratic equation. Two different things that you combined into one thing for some unknown reason. Neither of them, nor the inappropriate combination that you provided, are of any value for finding the solution to the coin problem stated. You are trying to saw a board in two using a teaspoon.

Go back and look at question 198744. Paste the following link into your browser:
http://www.algebra.com/algebra/homework/quadratic/Quadratic_Equations.faq.question.198744.html


John