The solutions to a quadratic equation are x = 2 and x = 7. if k is a nonzero constant, which of the following must be equal to the quadratic equation? mc013-1.jpg mc013-2.jpg mc013-3.jpg mc013-4.jpg

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3

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.

i would say c

step-by-step explanation: