Each day that i library book is kept past its due date a $0.30 fee is charged at midnight which ordered pair is a viable solution if x represents the number of days that i library book is late and y represents the total fee

please don't use this, i read your question wrong

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.

answer: 12x^2+6x

step-by-step explanation:

6x does not equal 24x. hope it works!