Determine whether the polynomial is a perfect square trinomial, a difference of squares, or neither.-81x2 + 64y2
A. Neither
B. Perfect square trinomial
C. Difference of squares
Answer: C
Mathematics
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Show that the function is a solution of the wave equation.w(x, t) = ex - ct
A. No B. Yes
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Solve the equation. 
= 9
A. -9 B. 9 C. -9, 9 D. 81
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Write the mixed number as an improper fraction. 7
A. 
B. 
C. 
D. 
Mathematics
Express the number in terms of i.
A. - i
B. 3i
C. ±3i
D. -3i
Mathematics