Given in the figure below, find the values of X and Z.

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

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with