1. Three different lengths of new curb are measured by three different inspectors as follows: 12.25 feet, 151. feet, and 25.0 feet. Find the total length of new curb using proper significant figures....

1. Three different lengths of new curb are measured by three different inspectors as follows: 12.25 feet, 151. feet, and 25.0 feet. Find the total length of new curb using proper significant figures.

2. Find the cross-sectional area of a pipe with diameter measuring 36 inches. Express the answer in metric units using the proper significant figures.