Given (x, y) coordinates, create a function such that each coordinate is uniquely mapped to an integer. also make sure that given an integer, you should be able to find (x, y) coordinates. so f(x, y) = z and also that inverse f(z) = (x, y).

need more info

step-by-step explanation:

$5.41

step-by-step explanation:

$20 - $14.51 = $5.49.

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.

b is the right answer