Add or subtract.(7x8 - 9x4 + 5x2 + 8) + (5x7 + 7x4 - 6x)
A. 7x8 + 5x7 + 2x4 + 5x2 - 6x + 8
B. 12x8 - 2x4 + 5x2 - 6x + 8
C. 7x8 + 5x7 - 2x4 + 5x2 - 6x + 8
D. 12x8 - 16x4 + 5x2 - 6x + 8
Answer: C
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A. 
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B. 
(2a + b)
C. 
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D. 
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?
?
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?
CS = $__________
Fill in the blank(s) with the appropriate word(s).