1. (9m + 6) + (-5m - 6)

A = 4m + 12

B = 14m + 12

C = 14m - 12

D=4m

3. (6h + 1) - (9h + 4)

A = - 3h - 3

B = 15h - 5

C = - 3h + 3

D = - 3h + 5

5. (4x + 4) + (3x + 2 + 1)

A = 7x + 3

B = x + 7

C = 7x + 7

D=8x + 6

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An open pit mine is being dug in the Buffalo Ridge mountain range. It will be 550 feet across and 290 feet deep. Based on sampling of the area, experts project that the company will be able to retrieve an average of about 0.

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