Which of the following are quadratic functions? Check all that apply
A. y = x - x^2
B. y = 5x-3x^2/4 + 1
C. y = 3x - 4
D. y = 2x^2 - 3x + 7

sas (side angle side)

aa (angle angle)

sss(side side side)

sas find two sides with an angle in between

aa is finding two angles and the third will add up to 180

sss find all sides

step-by-step explanation:

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.

hello,

as   long as they add up to 180 its correct.