Hi there!
The smallest value is 0.424
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You might think that 0.79 is the smallest one but it also has 0 which is not written. 0.790 is bigger than 0.424
I hope that helps!
A)
For x= -1
y=x^2-4x
y= (-1)^2 -4*(-1)
y= -3
For x=1
y = -3
For x=2
y =-4
For x=4
y= 0
B) the blue one
A is your answer my friend