For which function is f(x) not equal to f-1(x)?

a- f(x)=2-x
b-f(x)=2/x
c=f(x)=-x
d=f(x)=2x

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

Apack of gum would be considered a(n) necessity luxury item small ticket item unaccountable expense

If a distance of 75 yds is measured back from the edge of the canyon and two angles are measured , find the distance across the canyon angle acb = 50° angle abc=100° a=75 yds what does c equal?