Hurry it timed ill mark brainliest

which equation should be used to find the volume of the figure?

What aspects of lines have to be diffrent

What is the 12th term of b(n)=-4-2(n-1)

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.