Solve by completing the square.z2 + 18z = -66
A. {9 + 
}
B. {-18 + 
}
C. {9 ± 
}
D. {-9 ± 
}
Answer: D
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Find an equation of the set of all points equidistant from the points A(7,-8,-90 and B(-4,2,-10). Select the correct answer.
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Translate the phrase into a mathematical expression and then find the result.482 cell phone calls times 7
A. 482 ? 7; 3374 cell phone calls B. 482 ÷ 7; 3274 cell phone calls C. 482 ÷ 7; 3474 cell phone calls D. 482 ? 7; 3384 cell phone calls
Use the substitution method or the elimination method to solve the system. If the system has infinitely many solutions, express the ordered pair in terms of x or y.5x + 7y = 225x + 2y = 42
A. ( -10, 5) B. (-10, 7) C. (-4, 10) D. (10, -4)
Solve the problem.If an object is dropped from a tower, then the velocity, V (in feet per second), of the object after t seconds can be obtained by multiplying t by 32 and adding 10 to the result. Find an equation relating the velocity, V, to the number of seconds, t. Use this equation to find the velocity of the object at time 
A. 268.5 ft/sec B. 269.2 ft/sec C. 267.2 ft/sec D. 270.5 ft/sec