Can someone explain how to do this to me?

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?

Evaluate the expression for the given value of the variable 7a - 4a for a =8

John has 1/2 pound of oranges to share with julie. if they share the oranges equally, how much will each of them have?