Determine which of the following has an error and the correct explanation for that error?
?
A. ?15(1 - 6) = 15(1) - 15(6) error: distributive property
B. ?14(10 + 8x) = 140 + 8x error: commutative property
C. ?(6x - 5) = 1(-30x) error: combining like-terms
D. ?4(3x · 9x) = 4(3x) + 4(9x) error: commutative property
E. ?5(4x - 6) = 20x - 24 error: combining like-terms
Answer: C
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A. 
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B. 192?
C. 
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D. 
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Solve for the angle ?, where 0 ? ? ? 2?cos2? = 
A. ? = 
, 
, 
, 
B. ? = 0, ?, 2?
C. ? = 
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, 
D. ? = 
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Find the perimeter.a scalene triangle whose sides are 15 ft, 8 ft, and 16 ft
A. 38 ft B. 39 ft C. 64 ft D. 31 ft
Estimate the sum or difference by rounding each number to the nearest hundred.
A. 2513 B. 2600 C. 2510 D. 2500