Answer:
7a-2
Explanation:
to represent the perimeter of 2a-3 and 2a and 3a+1
The given sides are 2a-3 and 2a and 3a+1
To find out the perimeter we add all the sides
![Perimeter = 2a-3 +2a+3a+1](https://img.qammunity.org/2019/formulas/mathematics/middle-school/k0ck4hp5aol9izlmumh9o7094ji7bhfm9g.png)
Now combine like terms to add the terms
2a+2a+3a becomes 7a
-3+1 is -2
Now the perimeter becomes
![Perimeter = 2a-3 +2a+3a+1](https://img.qammunity.org/2019/formulas/mathematics/middle-school/k0ck4hp5aol9izlmumh9o7094ji7bhfm9g.png)
![Perimeter = 7a-2](https://img.qammunity.org/2019/formulas/mathematics/middle-school/c6j6zmlrs39nqpglp58fr613l32nmir475.png)
An expression to represents the perimeter is 7a-2