True or false to find the percent of a number we convert to a fraction or a decimal and then divide the number

What is the percent of increase for a population that changed from 438,000 to 561,000

Mike wants to make meatloaf. his recipe uses a total of 8 pounds of meat. if he uses a 3 to 1 ratio of beef to pork, how much pork will he use? enter your answer as a mixed number in simplest terms.

What is the gcf of 20c^3-5c^4+30c^6