DE is parallel to AC. True or False

What other information do you need to prove triangle dac=bca by asa

Nikolas calculated the volume of the prism. his work is shown below.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.