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Answer:
D
Explanation:
You substitute 4 in every space that has an n. 6+4 does not equal 24, so a is out. 5 times 4 is 20, not 54. 12-4=8, not 16. So the last is 7 times 4, which is 28, so this is the correct answer.
You multiply 4 by 7 then you get 28