1 - How do you use coordinates to find the perimeter and area of polygons? 2 - How do you write an equation of a line so that it is parallel or perpendicular to a given point and a given line?

Ibelieve the total for the tip could be $21.90

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

That they are numbers and related to each other.