How much colours are there in rainbow?

What is the term for the process of comparing data with the set of rules or values to find out if the data is correct? Can you answer 4 consecutive integers result is 24? What percent is 500 of 5200? What two numbers add to give you 2 and subtract to give you 1? How would you write 10011 in Hindu Arabic? What is a rational number between 3 and pi? For the function f x equals 2 - 3x find f 4? What is 675 divided by 2.25? How many hours is 23 124 248 minutes? How much topsoil in 1 acre? Is 23.7 an integer? How do you express a number in powers for eg 126 divide by 16 equals 7 to power 14 divide by 16 how? What is the Cos of angle B whe B and A is 13 and B and C is 5? What is the least common multiple of 7 14 and 49? What is 247 in scientific notation? Are 47 kit kats eaten every second in Britain? What action is modeled by the diagram? What is half of 35 full number? What is 16700 in scientific notation? How do you Round this number 5419?