Solve the problem.The polynomial function 
represents the yearly income (or loss) from a real estate investment, where t is time in years. After how many years does income begin to decline?
A. 10 yr
B. 9 yr
C. 13.3 yr
D. 20 yr
Answer: A
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Provide an appropriate response.Multiply: 5,300 × 600
A. 31,800,000 B. 3,180,000 C. 318,000 D. 31,800 E. none of the above
Rotate the axes so that the new equation contains no xy-term. Discuss the new equation.x2 + 2xy + y2 - 8x + 8y = 0
A. ? = 45°
y'2 = -4
x'
parabola
vertex at (0, 0)
focus at (-
, 0)
B. ? = 45°
x'2 = -4
y'
parabola
vertex at (0, 0)
focus at (0, -
)
C. ? = 36.9°
+ 
= 1
ellipse
center (0, 0)
major axis is x'-axis
vertices at (±2, 0)
D. ? = 36.9°
+ 
= 1
ellipse
center (0, 0)
major axis is x'-axis
vertices at (±2, 0)
Multiply.(p + 7q)(p - 7q)
A. p2 - 14q2 B. p2 - 14pq - 49q2 C. p2 - 49q2 D. p2 + 14pq - 49q2
Simplify the expression by combining like terms.2x - 2y + 4 - 9x
A. -7x - 2y B. -5xy C. -7x - 2y + 4 D. -7x + 2y