PleAsee help me find the answer

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume

Here is another math questions. i will keep asking different questions. 4^2x=6

Pls what is the decimal equivalent of 5 over 9? select one: a. 0 point 5 bar over top of 5 b. 0 point 6 bar over top of 6 c. 0 point 8 bar over top of 8 d. 0 point 9 bar over top of 9