Find the sign of the following.cot (? + 180°), given that ? is in the interval (270°, 360°).
A. positive
B. negative
Answer: B
Mathematics
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Solve the system by the elimination method.-7x - 52 = 9y 2x - 7y = 33
A. {(-2, -4)} B. {(-1, -4)} C. {(-1, -5)} D. ?
Mathematics
Graph the equation and give the coordinates of the vertex.y = x2 - 2x + 8 
A. (1, -9)
B. (-1, 7)
C. (-1, 9)
D. (1, 7)
Mathematics
Solve the problem. Round to an appropriate number of significant digits.Twice the water flow in the hot-water pipe is the same as three times the flow in the cold-water pipe. The combined flow is 1500 ?/hr. What is the flow in each pipe?
A. 900 ?/hr hot, 600 ?/hr cold B. 750 ?/hr hot, 500 ?/hr cold C. 600 ?/hr hot, 900 ?/hr cold D. 500 ?/hr hot, 750 ?/hr cold
Mathematics
Factor completely.15x4 - 26x3 + 8x2
A. x(3x + 4)(5x + 2) B. x2(15x - 1)(x - 8) C. (15x2 + 4)(x2 + 2) D. x2(3x - 4)(5x - 2)
Mathematics