Find all solutions of the equation in the interval [0°, 360°).cos2 ? + 2 cos ? + 1 = 0
A. {180°}
B. {360°}
C. {45°, 315°}
D. {90°, 270°}
Answer: A
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Write the rate as a unit rate.In a region, the total number of students enrolled in public schools in a recent year was 455,057. At the same time, there were 24,432 public school teachers. Write a unit rate in students per teacher. Round to the nearest whole student.
A. 20 students/teacher B. 21 students/teacher C. 18 students/teacher D. 19 students/teacher
Use completing the square to rewrite the equation in one of the standard forms for a conic and identify the conic.x2 + y2 + 10x - 4y + 18 = 0
A. 
- 
= 1; hyperbola
B. (x + 5)2 + (y - 2)2 = 11; circle
C. 
+ 
= 1; ellipse
D. (x - 5)2 + (y + 2)2 = 
; circle
Graph the equation.y = 
A. 
B. 
C. 
D. 
Solve the equation.log9x = 
A. 512 B. 3 C. 81 D. 0.00195312