A prime number is a natural number that is larger than 1 and can only be divided exactly by itself and 1.Which of the following sets of numbers contains only prime numbers?
A. { 31, 29, 35 }
B. { 25, 11, 31 }
C. { 19, 29, 31 }
D. { 11, 19, 12 }
E. { 19, 15, 29 }
Answer: C
Mathematics
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B. 
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Find the product.(7x + 11y)(4x - 4y)
A. 28x2 + 16xy - 44y2 B. 28x2 - 28xy - 44y2 C. 28x2 + 44xy - 44y2 D. 28x2 + 16xy + 16y2
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