Solve the quadratic inequality by sketching the graph of the corresponding quadratic function.x2 + 5x + 9 < 0
A. Solution: (-?, 0)
B. Solution: (-?, ?)
C. Solution: [0, ?)
D. Solution: ?
Answer: D
Mathematics
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Write the number as a product of a real number and i. Simplify the radical expression.
A. i
B. -40i
C. 40i
D. ± 40
Mathematics
Simplify the complex fraction.7 + 
A. 
B. 
C. - 
D. 
Mathematics
Solve.
= 
A. 2 B. 3 C. 7 D. 4
Mathematics
Solve the problem.What is the intensity in watt/m2 of a noise measured at 80 decibels? D = 10 log (S/S0), where S0 is 10-12 watt/m2. (Round to 3 significant digits.)
A. 2.98 × 1015 watt/m2 B. 1 × 10-3 watt/m2 C. 1 × 10-4 watt/m2 D. 8 × 10-10 watt/m2
Mathematics