When Charlotte installed a fence along the 200 foot perimeter of her rectangular backyard, she left an opening for a gate. In the diagram below, she used x to represent the length, in feet, of the gate. What is the value of x

Answer:
x = 10
Step-by-step explanation:
P = 2(60 + x) + 2(30) = 200
= 120 + 2x + 60 = 200
2x + 180 = 200
2x = 20
x = 10