Someone please help I find this confusing

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

The domain of a function can be represented by which one of the following options? o a. a set of output values o b. a set of f(x) values o c. a set of input values o d. a set of both input and output values

Build is 120 wide 20 feet high 48 feet long how many cubic feet and the volume