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7m - 3n
m = 3, n = 2
Replace m and n with the appropriate numbers:
7(3) - 3(2)
Multiply both sides:
21 - 6
Subtract:
21-6 = 15
Remember to follow PEMDAS.
Note that: m = 3, n = 2
Plug in the corresponding numbers to it's variable
7m - 3n
7(3) - 3(2)
Simplify each term by multiplying
7 x 3 = 21
3 x 2 = 6
Subtract:
21 - 6 = 15
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15, or (B) is your answer
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hope this helps