Graph the function over a one-period interval.y = - 
cos
+ 2
A. 
B. 
C. 
D. 
Answer: C
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Find the center, radius, and intercepts of the circle.x2 + y2 - 2x + 4y - 7 = 0
A. (h, k) = (1, -2), r = 2
x-int: x = 1 ± 2
; y-int: y = -2 ± 
B. (h, k) = (-1, 2), r = 12
x-int: x = 1 + 2
; y-int: y = -2 + 
C. (h, k) = (-1, -2), r = 2
x-int: x = 1 + 2
; y-int: y = -2 + 
D. (h, k) = (1, -2), r = 2
x-int: x = -1 ± 2
; y-int: y =2 ± 
Solve the problem.A balloon is rising vertically at a distance of 
from an observer. When the angle of elevation is 
it is changing at a rate of 
How fast is the balloon ascending?
A. 5.6 ft/s B. 3.0 ft/s C. 3.3 ft/s D. 2.8 ft/s
Find the direction angles of the vector. Round to the nearest degree, if necessary.v = -4i - 12j - 6k
A. ? = 91°, ? = 94°, ? = 92° B. ? = 108°, ? = 161°, ? = 118° C. ? = 108°, ? = 157°, ? = 117° D. ? = 107°, ? = 149°, ? = 115°
Solve the problem using your calculator.A study was conducted to compare the average time spent in the lab each week versus course grade for computer students. The results are recorded in the table below. Use a graphing calculator to model the data with a linear function that predicts a student's course grade as a function of the number of hours spent in lab. Number of hours spent in lab Grade (percent) 10 96 11 51 16 62 9 58 7 89 15 81 16 46 10 51
A. y = 0.930 + 44.3x B. y = 1.86 + 88.6x C. y = 44.3 + 0.930x D. y = 88.6 - 1.86x