Based on the calculations, a number which is 0.1 less than 173.89 is equal to: D. 173.99.
How to determine the unknown number?
In order to determine the unknown number, we would assign a variable (x) to it and then translate the word problem into an algebraic expression.
Translating the word problem into an algebraic expression, we have;
x - 0.1 = 173.89
Next, we would add 0.1 to both sides:
x - 0.1 + 0.1 = 173.89 + 0.1
x = 173.89 + 0.1
x = 173.99.
Read more on word problems here: brainly.com/question/13170908
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