Answer:
3
Step-by-step explanation:
Since there is no increase in height, we will look at the horizontal distance.
We can compare the distance from<em> (0,0) to (5,0) and (15,0)</em>
Distance from (0,0) to (5,0) = <em>5 units</em>
(0,0) to (15,0) = <em>15 units</em>
So, k is the ratio of the new distance over the original: <em>k = 15/5</em> --> k = 3