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Explanation:
10m+n^2÷4
10(5)+4^2÷4
50+64÷4
(50×4)+64÷4
(200+64)÷4
264÷4
66
Substitute these values.
10m + n²/4 = 10(5) + (4)²/4
50+16/4
50+4
54
there the answer is 54