Factor the four-term polynomial by grouping.20x4 + 15x2 - 12x2 - 9
A. (20x2 + 3)(x2 - 3)
B. (5x4 - 3)(4x + 3)
C. (5x2 + 3)(4x2 - 3)
D. (5x2 - 3)(4x2 + 3)
Answer: D
Mathematics
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Use the appropriate addition formula to find the exact value of the expression.sin 
A. 
B. - 
C. 
D. 
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Determine the inequality which matches the calculator graph. Do not use your calculator. Instead, use your knowledge of the concepts involved in graphing inequalities.
A. y ? x B. y ? -x C. y ? x D. y ? -x
Mathematics
Find the length of the third side of the right triangle. Where appropriate, give both an exact answer and an approximation to three decimal places.
A. 
? 6.633
B. 386
C. 
= 193.0
D. 
? 19.647
Mathematics
Select the right expression for the following sum and prove that your statement is true for all natural numbers n.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Mathematics