Can someone please help me with this

What is the missing constant term in the perfect square that starts with x^2 -20x

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?

Determine which postulate or theorem can be used to prove that lmn =nmo