Can a real number be both rational and irrational?

Ineed with number 17 i don’t get it at alll

Write two subtraction equations that are equivalent to 5 + 12 = 17.

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?