Tell if the square root is rational, irrational, or not a real number. If the square root is rational, find the exact value; if the square root is irrational, write the approximative value rounded to 2 decimal places.
A. irrational, 
B. rational, 
C. irrational, 0.38
D. not a real number
Answer: B
Mathematics
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A. - 
B. - 
C. - 
D. - 
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Decide whether the equation is an identity, a conditional equation, or a contradiction. Give the solution set.2(3x + 20) - 6x - 40 = 0
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B. -i
C. ±5
D. 5i
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