In a 25' long guardrail, what is the center spacing of the posts if mounted on 8 spots?

Answer: C — 3.57'

To determine the center spacing of the posts for a 25-foot long guardrail mounted on 8 spots, it's essential to calculate the spacing by taking into account the total number of intervals created by those spots. When you have 8 posts, the number of spaces between them is one less than the number of posts. Thus, with 8 posts, you effectively have 7 intervals or spaces to distribute the 25 feet. To find the center spacing, you will divide the total length of the guardrail by the number of intervals: 25 feet / 7 intervals = approximately 3.57 feet. This calculation shows that the correct spacing between the centers of each post is about 3.57 feet, which aligns with the provided answer. This approach ensures that the guardrail is evenly supported and structurally sound.