I can use the distance formula, which says that the distance between two points (x1, y1) and (x2, y2) is sqrt((x2 - x1)^2 + (y2 - y1)^2). Plugging in the values, I get sqrt((7 - 0)^2 + (-24 - 0)^2). Simplifying, I get sqrt(49 + 576). Adding, I get sqrt(625). Taking the square root, I get 25. So the distance is 25 units. 
In a rectangular coordinate system, what is the number of units in the distance from the origin to the point (7, -24)?