Answer:
50 + x + 50 + x = 260, or
100 + 2x = 260, or
50 + x = 130,
Step-by-step explanation:
1. 1 1/2 feet
2. 0.46
3a. 0.62 I'm not sure if this one's correct, it's worded weird
3b. -3.43
3c. 0.14
3d. -0.481