Is the gcf of a even number always 2

No. GCF means Greatest Common Factor. So let's say you picked the number 4 and 8..Their GCF is 4 and not 2 despite the fact that they are even numbers.. GCF changes according to the number range.. So you can't always expect it to be 2 for even numbers.. Hope I answered your question.

The distance from point a to point c across the coordinate plane is aproxamatly 8.94 rounded to the nearest hundredth. you use a^2 + b^2 =c^2