What is the value of negative 3 m n plus 4 m minus 3 when m is equal to 2 and n is equal to negative 4 ?

Substitute m = 2 and n = −4 into −3mn + 4m − 3. This gives −3(2)(−4) + 4(2) − 3 = 24 + 8 − 3 = 29, so the value is 29, choice C.

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