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y=2x+5
2x=y-5
x= y-5 / 2
f^-1(x) = x-5 / 2
b. f^-1(0)= 0-5/2= -5/2
f^-1(2)= 2-5/2= -3/2
f^-1(3)= 3-5 /2= -2/2=-1