What is the ratio of the volume of the cylinder to the volume of the cone, when x=2 and y=2?

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.

Which letters from the table represent like terms? a and b b and c a and d b and d

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16