B)
It is "B" because 1.6 is how much detergent they use.
Hope this helps:)
Answer:
There are, however, three words in geometry that are not formally defined. These words are point, line and plane, and are referred to as the "three undefined terms of geometry".
Step-by-step explanation:

Explanation

Step 1
multiplicate by the conjugate

notice that


I hope this helsp you