Use the information given in the diagram to find A to the nearest degree. Suppose that 
and 
.
?
?
A. ?
B. ?
C. 
D. ?
E. ?
Answer: C
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Rotate the axes so that the new equation contains no xy-term. Discuss the new equation.31x2 + 10
xy + 21y2 -144 = 0
A. ? = 45°
x'2 = -4
y'
parabola
vertex at (0, 0)
focus at (0, -
)
B. ? = 36.9°
+ 
= 1
ellipse
center at (0, 0)
major axis is x'-axis
vertices at (±3, 0)
C. ? = 45°
y'2 = -4
x'
parabola
vertex at (0, 0)
focus at (-
, 0)
D. ? = 30°
+ 
= 1
ellipse
center at (0, 0)
major axis is y'-axis
vertices at (0, ±3)
Factor the polynomial completely. If the polynomial is prime, so state.a2 + 9ab + 14b2
A. (a + 2b)(a + 7b) B. (a - 2b)(a + b) C. (a - 2b)(a + 7b) D. Prime
Identify the intervals where the function is changing as requested.Decreasing
A. (-?, 3) B. (0, -2) C. (-?, -2) D. (0, 3)
Solve the equation by factoring.x(x - 9) + 20 = 0
A. {-4, -5} B. {4, 5} C. {-4, 5} D. {4, -5}