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Chemistry is used in the synthesis of new drugs. It is also used in the design and sythesis of new polymers which are increasingly being used in composite materials to replace metals. Chemistry is used in the synthesis of more environmentally friendly materials that have a lower toxicty profile. There are many other uses too.
Prime numbers and composite numbers are not used in daily jobs. However they are used by scientists to prove theorems.
3 can be used.
To find a composite number, check if the number can be divided by 2,3,4,5, ect. If it can, it`s composite. If not, it`s prime.
Well they are used for multipling dividing adding and subtraction