Which are the roots of the quadratic function f(b) = b? - 75? Select two options.
b=573
b= -5/3
b=35
b= -35
b= 2573

i dont know

step-by-step explanation:

umm. i dont know

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.