I need the proof, please write it clear

Given: ac and db are diameters. m∠3=

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

You are on a cycling trip around europe with friends. you check the weather forecast for the first week. these are the temperatures for the week. sun mon tues wed thurs fri sat 16°c 20°c 24°c 28°c 28°c 23°c 15°c what is the mean temperature forecast for the week?