A stake is marked 3+00 and has an elevation of 61.50. The next stake is marked 3+50 and has an elevation of 61.00. What is the slope?

windy city oil field, karamay, xinjiang, China

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Worker in a carpentry shop measures plywood for cutting

Apartment Fusebox Installation by Caucasian Electrician in His 40s. Residential Home Electric System Theme.

Joyful young man construction worker holding mobile phone and smiling while standing by the table with laptop