Factor the perfect square trinomial completely.x2 - 15x + 225
A. (x + 15)2
B. (x + 15)(x - 15)
C. (x - 15)2
D. prime
Answer: D
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Find all real numbers in the interval [0, 2?) that satisfy the equation. cos2 x - 1 = 0
A. 
B. {0}
C. {0, ?}
D. 
Solve the system of equations by graphing.
A. (5, 3) B. (5, 1) C. no solution D. (6, 2)
Provide an appropriate response.Is this proportion true or false: 
= 
? Which method did you use to determine the answer?
What will be an ideal response?
Solve the problem.The storage tank has the form of a cylinder with one hemisphere end (see figure). The perimeter of a circular cross-section perpendicular to the axis of symmetry of the tank was measured at 
and the perimeter of a cross-section lying in the plane containing the axis of symmetry was measured at 
Approximate the worst possible percentage error in the volume of the tank. Assume that the sides and ends of the tank are of negligible thickness.
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A. 75.0
B. 0.3
C. 600.0
D. 28.8