Bounds and effects of measurement error

Answer: 78.75

1. The side lengths are less than 7.5 and 10.5. Multiplying the upper bounds gives an area upper bound of 78.75cm2; the area is strictly below it.

Answer: 3.375

1. The smallest possible edge is 1.5cm. Cube this lower bound: 3.375cm3.

Answer: 5

1. The greatest distance from the rounded value is half the rounding unit: 210​=5mm.