Which of the following is the best term for the type of experiment described below? 50 people are randomly selected to participate in a clinical drug trials in which one half will receive the actual drug and the other half will receive a placebo. Neither the researchers conducting the experiment nor the subjects participating will know who receives switch

A. Randomized experiment

B. Controlled experiment

C. Biased Experiment

D. Double blind experiment

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!

I’m confused because i this angle is less than 180 degrees but more than 90 degrees am i just totally wrong. i don’t know i’m confused. plz explain. thx