Answer: 1. 7x + 6, 2. 7x-4y, 3. 7x - (29/24)y
Step-by-step explanation:
The perimeter of the triangle is the sum of the sidelengths.
The first one is 2x + 3x + 11 + 2x - 5.
Combining like terms, we get 7x + 6.
The second one is 2x - y + 3x + 2y + 2x - 5y
Combining like terms, we get 7x - 4y
The third one is 2x - (3/4)y + 3x + (3/8)y + 2x - (5/6)y
Combining like terms, we get 7x - (29/24)y
