If the domain of the function f = {(x, y) | 2x + y = 7} is {1, 2, 3}, what is the range?

The range of the function is {1,3,5}.

Step-by-step explanation:

The function is defined as

The set of all possible inputs is called domain and the set of output is called range.

In other words the possible values of x are elements of domain and the values of y are the elements of range.

Since the domain is {1,2,3} and the function is

Put x=1

Put x=2

Put x=3

Since the possible values of y are 5,3 and 1, therefore the range of the function is {1,3,5}

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.