Factor completely.64x2 + 25
A. (8x + 5)(8x - 5)
B. (8x + 5)2
C. Prime
D. (8x - 5)2
Answer: C
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Use reference angles to find the exact value of the expression. Do not use a calculator.tan 
A. 0 B. 1 C. -1 D. undefined
Express the number in scientific notation.0.000019812
A. 1.9812 × 104 B. 1.9812 × 105 C. 1.9812 × 10-4 D. 1.9812 × 10-5
Use the Gauss-Jordan method to find A-1, if it exists.A = 
A. 
B. 
C. 
D. Does not exist
Determine whether the argument in the problem below is valid or invalid. If valid, name the type of reasoning and if invalid, determine the error in reasoning. ? All mathematicians are clever men. All clever men are rich. Therefore, all mathematicians are rich. ?
A. invalid; direct B. valid; indirect C. valid; direct D. invalid; false chain E. valid; transitive