All the relevant inequality signs for each given number are as used below.
<h3>How to use equality symbols?</h3>
15) π is approximately 3.14 and 19/6 is approximately 3.167. Thus, the inequality here is; π < 19/6
16) √81 is +9 which is positive and -√121 is -11 which is negative. Thus, the inequality here is; √81 > -√121.
17) Negative number is always lesser than a positive number and as such the inequality here is; -14/15 < √0.87
18) From the given three numbers, we have;
1.875, √64 = 8, and -√121 = -11.
in order from least to greatest, we have; -√121, 1.875, √64
19) The given numbers we can say that;
√67.4698 ≈ 8.214.
64.56/8.477 ≈ 7.616
8.775
Thus, in order from least to greatest would be;
64.56/8.477, 8.214, 8.775
20) From the given 3 numbers, we can say that;
π ≈ 3.1416
√10.565 = 3.25
-15/5.8
Thus, in order from least to greatest we have -15/5.8, π, √10.565
Read more about Equality Symbols at; brainly.com/question/11457776
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