Final answer:
To find the new lengths of the sides of the enlarged triangle, each side length needs to be multiplied by the scale factor of 3.
Step-by-step explanation:
To find the new lengths of the sides, we need to multiply each side length by the scale factor of 3.
The new length of the side that is 5 units is 5 x 3 = 15 units.
The new length of the side that is 15 units is 15 x 3 = 45 units.
The new length of the side that is 13 units is 13 x 3 = 39 units.