Ireally need its a test

if f -1(x) is the inverse of f(x), which statements must be true?
check all that apply.
a. f ^-1(f(x)) = x
b. f(f ^-1(x)) = x
c. the domain of f ^-1(x) is the domain of f(x).
d. the domain of f^ -1(x) is the range of f(x).
e. the range of f^ -1(x) is the domain of f(x).
f. the range of f^-1(x) is the range of f(x).

Given the parent function of [tex]f(x)=x^4[/tex], what change will occur when the function is changed to [tex]f(\frac{1}{2} x)[/tex]?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list