What is STM-16c?

Is the product of two numbers is never less than either of the numbers? What is a solid figure with 5 faces 8 edges and 4 vertices? What are not always true if two figures are similar? What is 4c 1 -(5 2c)? Is 8 dm equal to 80 cm? What are regular and irregular solids? What happens to the sample size if you increase the standard deviation? Blood carries wastes that contain what? What is the number 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000? What fraction of 14g is 12g? How fast must Horatio ride to finish at the same time as Davie if they are on a scenic tour that is 80 miles long and Davie rides at 20 miles per hour and leaves 90 minutes before Horatio? 64 plus what equals 91? What is the Roman Numeral mdclxxx111? What does strength 5 mean? What is the 18 times tables to 20? What time is 3 and a half hours after 11.20am? What are the steps for 7x plus 8 equals 36? How do you put 96 108 90 127 100 102 103 103 98 103 107 93 in order? Why is progression important? Why do ping pong balls float?

What is STM-16c?