Colin uses his phone for everything, so he likes to keep it with him at all times. lately, though, he's found it difficult to concentrate when he's studying because people often call him or send him a text message. what should colin do to improve his concentration?

What task did the surveyors do? a. they studied the landscape to determine the most direct route for building a road. b. they designed treadmills that lifted blocks of stone to where they were needed. c. they dug trenches and filled them with sand, concrete, and large blocks to form a road.