D.
1 3/7 = 1.43
therefore from least to greatest it would need to be
1.38,1.4,1.43
or in the question
1.38, 1.4, 1 3/7
Therefore the answer would be D.
Hope this helps!
Answer:
56/40 + 15/40 = 71/40
Step-by-step explanation:

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A. 
Hopefully, this helps you!!

(7^0)^x = 1
7 power zero is 1.
(1^x) = 1
So x can be any value.
x could be, -2, -3, 1, 0, 3, 5, 1.8, -1.5,
x could be any number positive or negative or even zero.