Manuel works at a weather station with extremely accurate equipment. his car’s sensor said the temperature was 30 degrees, but when he checked the actual temperature at work, it was 28.8 degrees. what was the percent error for his car’s sensor?

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?