Describe the graph of the polar equation.r2 = 42r cos ?
A. Circle of radius 21 and center (0, 21)
B. Horizontal line passing through (0, 42)
C. Circle of radius 21 and center (21, 0)
D. Vertical line passing through (42, 0)
Answer: C
You might also like to view...
Find the magnitude of u × v and the unit vector parallel to u × v in the direction of u × v.u = 7i - 5i + 6k, v = 0
A. 
; 
(7i - 5i + 6k)
B. 0; 7i - 5i + 6k
C. 0; no direction
D. 0; 
(7i - 5i + 6k)
Solve the problem.In a local election, 25,100 people voted. This was a decrease of 8% over the last election. How many people voted in the last election?
A. 27,108 people B. 27,283 people C. 23,092 people D. 23,241 people
Solve the problem.An airplane is sighted at the same time by two ground observers who are 5 miles apart and both directly west of the airplane. They report the angles of elevation as 15° and 
How high is the airplane?
A. 1.29 mi B. 5.14 mi C. 3.15 mi D. 2.11 mi
Use a graphing calculator to sketch the graph of the quadratic equation, and then state the domain and range.y = x2 + 2x - 5
A. D: all real numbers; R: (y ? -5) B. D: all real numbers; R: (y ? -6) C. D: all real numbers; R: all real numbers D. D: all real numbers; R: (y ? -6)