Who invented the math annulus?

Ratios that are equivalent to 6:5 .? What steps to do to get 0.006 in scientific notation? What are 5 main parts of a graph? What is the percent of 750 out of 2000? What are two eights of 32? What is a number out of 100? How do you graph the elements of a set? What is the function of a standard french curve? What is another way to write the expression t . (14-5)? How many lines of symmetry does a g have? What is one fifth plus three fourth? What is it called when two or more factors are multiplied together? What divides something in half so that each half is a mirror image of each other? What is 18 percent of 318? What is 93.2 degrees Fahrenheit to Celsius? What is the size of the worlds largest acorn? Where is 0.75 on a 3ml syringe? What does an INR of 3.7 mean? Does a regular pentagon have rational symmetry? How many blue cars are there in England?