Find each union or intersection. Let A = {2,5), B = {5,7,9, C = {x\x is an odd number less than 9}, and D = {x|x is an even number less than 9}.
Find CND?

The verbal translation for the difference of m and 7 increased by 15

This is so hard and it’s for a test

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?