The distance between p and t on the coordinate grid is
units. can only use whole numbers

Both points are connected by a horizontal line, so we only have to check the x-axis values. Point P is at x = -10. Point T is between x = 10 and x = 20, and appears to be in the middle, so we can assume that it is at x = 15.

Then the distance between P and T is calculated by subtracting the x-values: 15 - (-10) = 25 units.