Population of the world was 5.7 billion in 1995 and the observed growth rate was 2% per year. by what year will the population triple?

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?

The sum of two numbers is 12 and their difference is 18 what are the two numbers