12a-3b2. When a=9 b=4. Please explain steps

I think you may mean:

12 a - 3 b^2

12*9 - 3 * 4^2

108 - 3 * 16

108 - 48

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please i need help with this question im in 6th grade,can u help me with it

11(d-c)+3(c+d) when c=6 d= 9

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i need help on this question

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