180 books because there's 6 shelves with 30 books on each shelf. 6×30=180 I believe that is the answer we are looking for.
56.72 to the nearest tenth is 56.70
The sum of the length of the two sides of the triangle must be greater than the length of the third side. None of the triangles is formed. Then option A is correct.
<h3>What is the triangle?</h3>
Triangle is a polygon that has three sides and three angles. The sum of the angle of the triangle is 180 degrees.
The sides of the triangle are 4.7 m, 1.6 m, and 2.9 m.
The condition will be

We know that the sum of the length of two sides of the triangle must be greater than the length of the third side.
Hence, none of the triangles is formed.
Thus, option A is correct.
More about the triangle link is given below.
brainly.com/question/25813512
Help her understand the situation, explain to her calmly who you are and where she is, and why she cannot see her husband