Use the quadratic formula to solve the quadratic equation.x2 - 4x = 21
A. -7, 3
B. 7, -3
C. 7, 3
D. -7, 1
Answer: B
Mathematics
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Use the graph of population change per year for a metro area to answer the question. 
What is the difference of the 1998 and 1997 population changes?
A. 3797 B. 4843 C. -4843 D. -3797
Mathematics
Solve the inequality, then graph the solution.-12 < 4y ? 4 
A. [-3, 1)
B. (-3, 1)
C. [-3, 1]
D. (-3, 1]
Mathematics
Write the number in scientific notation.0.000080518
A. 8.0518 × 104 B. 8.0518 × 10-4 C. 8.0518 × 10-5 D. 8.0518 × 105
Mathematics
Add or subtract.(5x2 + 2x + 2) - (2x2 + 10)
A. 3x2 - 8x + 2 B. 3x2 + 2x - 8 C. 7x2 + 2x + 12 D. 7x2 - 8x + 2
Mathematics