Can someone tell me the answer to 9c+3+13–4c+4–8c??

Can you also make your answer detailed? I also want to practice onthe answer I'm given

What is the prime factorization of 230

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Mr. vector door is buying two new cowboy hats all together the hats cost $75.12 the second heart cost twice as much as the first hat what is the price of the more expensive at round to the nearest hundredth