Final answer:
The correct number sentence that matches the word problem is 4 + 3 = 7.
Step-by-step explanation:
The number sentence that matches the word problem is 4 + 3 = 7.
To find the total number of cats Lauren's family and Mike's family have together, we need to add the number of cats each family has. Lauren's family has 4 cats and Mike's family has 3 cats, so the total number of cats is 4 + 3 = 7.
Therefore, option B, 4+3=7, is the correct number sentence that matches the word problem.
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