Find the vertex of the parabola by completing the square.y = x2 + 2x - 4
A. (-1, -5)
B. (-1, 3)
C. (1, -3)
D. (1, -5)
Answer: A
Mathematics
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Solve the problem.A tower is 618 meters high, and it has an observation deck at the 343-meter level. How far from the top of the tower must a 618-meter-high helicopter be in order that the angle subtended at the helicopter by the part of the tower above the deck equals the angle subtended by the part of the tower below the deck?
A. 829 m B. 18 m C. 1034 m D. 91 m
Mathematics
Subtract.
A. 838 B. 254 C. 256 D. 156
Mathematics
Simplify the radical expression. Assume that all variables represent positive real numbers. 
A. 5a2b4
B. 5ab2
C. 5ab2
D. 5a2 b4
Mathematics
Round the number to the given place value.A clothing store has a shirt on sale for $18.95. Round this value to the nearest dollar.
A. $18.0 B. $19 C. $18 D. $18.95
Mathematics