Solve using the addition and multiplication principles together.2r + 8 = 28
A. 10
B. 22
C. 18
D. 6
Answer: A
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Rotate the coordinate axes to change the given equation into an equation which has no cross product (xy) term. Identify the graph of the equation as a hyperbola, ellipse, parabola, a straight line, or parallel lines.3x2 + 2
xy + y2 - 9
x + 5y - 18 = 0
A. 4u2 - 
v2 - 11u + 7
v - 18 = 0; Hyperbola
B. 4u2 - 11u - 18 = 0; Parallel lines
C. 4u2 - 11u + 7
v - 18 = 0; Parabola
D. 4u2 + 
v2 - 11u + 7
v - 18 = 0; Ellipse
? = central angle of a circle, r = radius of the circle, s = length of the intercepted arc, 
speed, 
speed, and t = time. Find the missing quantity. Give an exact answer unless otherwise indicated.r = 4 meters, ? = 
radians, s = ?
A. 
m
B. 36? m
C. 
m
D. 
m
Divide, if possible. Write the answer in simplest form.
÷ 
A. 
B. 
C. 2
D. 
Find the angle between v and w. Round your answer to one decimal place, if necessary.v = -4i,
w = j
A. 0° B. 90° C. 180° D. 270°