Iam not able to get this one.sides of a rectangular plot of land are measured correct to nearest metre.measurement s given as 20m by 3m.so what is upper bound of the plot length?,the least possible perimeter of the plot?

you know that

the length is between 19.5 and 20.5 meters
the width is between 2.5 and 3.5 meters

So, use the largest and smallest values to get the range of perimeters.

To find the upper bound of the plot length, we need to consider the maximum possible length that the plot could have. Since the measurements are given as 20m by 3m, we know that the actual length could be anywhere between 19.5m (20m - 0.5m) and 20.5m (20m + 0.5m) due to the rounding error.

So the upper bound of the plot length is 20.5 meters.

To find the least possible perimeter of the plot, we must first determine the minimum possible dimensions of the plot. The minimum values would be obtained by subtracting 0.5m from each side.

So, the minimum possible dimensions are 19.5m by 2.5m.

To find the perimeter, we use the formula:

Perimeter = 2 * (length + width)

Considering the minimum possible dimensions, the least possible perimeter would be:

Perimeter = 2 * (19.5m + 2.5m)
= 2 * 22m
= 44 meters.

Therefore, the least possible perimeter of the plot is 44 meters.