Answer:
3.1 ft
Step-by-step explanation:
You need to use the Pythagorean Theorem to solve for the leg of the triangle and then double that answer to get the length of the entire line of "x".
a²+b²=c²
1.4²+b²=2.1²
1.96+b²=4.41
b²=2.45
b=1.565247584249853 (this is the leg of the triangle)
now multiply by 2
x=3.130495168499706
Round to nearest tenth
3.1 ft
