Determine the sign and the absolute value of the number.8.5
A. Sign: -; absolute value: 8.5
B. Sign: +; absolute value: 8.5
C. Sign: +; absolute value: -8.5
D. Sign: -; absolute value: -8.5
Answer: B
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Find the center of mass of the thin rod with the given density function.Find the center of mass of a thin rod that lies along the semicircle y = 
if the density of the rod is 
A. 
= 
?, 
= 
?
B. 
= 
?, 
= 
?
C. 
= 0, 
= 
?
D. 
= 0, 
= 
?
Find the area of the polygon.
A. 81 km2 B. 27 km2 C. 324 km2 D. 162 km2
Identify the equation as a parabola, circle, ellipse, or hyperbola.y2 = 121 - x2
A. Circle B. Ellipse C. Parabola D. Hyperbola
Write the equation of the line in slope-intercept form.Write the equation of the line perpendicular to y = 
x + 4 that passes through the point (3, 4).
A. y = 8x - 28
B. y = - 8x - 28
C. y = - 
x - 
D. y = - 8x + 28