An educated guess is like an estimate except instead of completing a problem you use other variables (such as familiar numbers or simplified answers) to answer the question. An educated guess can be supported by evidence by using the parts of a you used to come up with the guess in your answer. I believe 2^1 is equal to 2 because any number raiser to the power of 1 is equivalent to one. The because is you evidence and the answer is your educated guess. Hope this helped!