<h2>
Answer:</h2>
The perimeter of triangle ABC to the nearest unit is:
14 units
<h2>
Step-by-step explanation:</h2>
We know that the perimeter of a triangle is the sum of length of all the sides of a triangle.
In the following triangle we have:
Perimeter ABC=AB+BC+CA
We are given AB=3 units , BC=5 units and 
Hence, the perimeter of triangle ABC is:

Hence, to the nearest unit we get:
Perimeter is: 14 units.