Anyone know how to do this people are answering the question but aren’t choosing two anwsers

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

How do i do this activity, is appreciated

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?