I think it's the answer C, because in the second and third pairs, the -2 are the same.
C.
4 (x+7) = 38 represents the tape diagram correctly.
Answer:

Step-by-step explanation:

Answer:
A. 31/100
Step-by-step explanation:
Change 3/10 to hundreds:
3/10 × 10/10 = 30/100
The denominator (the bottom number) must be 100.
61 - 30 is 31.
The missing number is 31/100. See image.