If 
, find ?h?(3.8).
?
A. 
B. ?
C. ?
D. ?
E. ?
Answer: D
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Find the center of mass of a thin plate covering the given region with the given density function.The region bounded by the parabola y = 81 - x2 and the x-axis, with density ?(x) = 9x2
A. 
= 
, 
= 0
B. 
= 0, 
= 
C. 
= 0, 
= 
D. 
= 0, 
= 
Perform the indicated operation.
+ 
A. 
B. 
C. 
D. 
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 781. Find a linear equation, in slope-intercept form, that relates the score, y, to the number of hours spent in the review course, x.
A. y = -4.025x + 499.25 B. y = 3.6225x - 503.25 C. y = 4.025x + 499.25 D. y = 3.6225x + 503.25
Find the equation of variation if the following is true.Suppose p varies directly as q and p = 1 when q = 
.
A. p = 17q
B. p = 19q
C. p = 
q
D. p = 18q