D the argument is not valid because the conclusion does not follow from the premises
6 divided by 1/4 = 24 + 12 divided by 1/4 = 48, then 48 + 24 = 72
Answer:
The answer is 
Step-by-step explanation:
∵ √24 = 2√6
∵ 
∵ 
∴ 
X - distance between Jie and Xiaoqing.
Answer:
12x+24x+18 and 36x+24-6 can both be simplified into 36x+18, meaning the equation is an identity