Solve the equation.- 
a = 0
A. {1}
B. {-21}
C. {21}
D. {0}
Answer: D
Mathematics
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A. 6?r3 B. 6?r(x - 7)(x + 7) C. 6?r(x + 49) D. 294?r
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Determine the exact value of the expression without the use of a calculator.sin 75° cos 15°
A. 
B. 
C. 
D. 
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Find the vertex of the parabola.f(x) = x2 - 20x + 108
A. (8, 0) B. (0, 10) C. (8, 10) D. (10, 8)
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Solve the formula for the specified letter.P = 
for t
A. t = 
B. t = Fd - P
C. t = 
D. t = P - Fd
Mathematics