I need this question answered fast ;c Find the percent change from 29 to 18. Round to the nearest tenth

Need on this geometry question. explain how you did it.

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.