If f^-1(y) is the inverse of f(x) which statements must be true?

a) f(f^-1(x))=x
b) f^-1(f(x))=x
c) the range of f^-1(y) is the range of f(x)
d) the range of f^-1(y) is the domain of f(x)
e) the domain of f^-1(y) is the range of f(x)
f) the domain of f^-1(y) is the domain of f(x)

Matt is driving down 7th street. he drives 150 meters in 18 seconds. assuming he does not speed up or slow down, what is his speed?

Ablock of steel has a density of 0.29lbs per cubic inch. if the block has dimensions of 1 inch by 1 inch by 3 inches, what is its weight? a. 0.29lbs b. 0.58lbs c. 0.87lbs d. 1lbs

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e