Use logarithmic differentiation to find the derivative of y with respect to the independent variable.y = x7 sin x
A. 7 cos x ln x + 
B. x sin x
C. 7 x7 sin x
D. 7 sin x ln x
Answer: C
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Parametrize the surface S.S is the portion of the sphere x2 + y2 + z2 = 81 between z = - 
and z = 
.
What will be an ideal response?
Factor, if possible.24x2 + 20xy - 24y2
A. 4(3x - 2y)(2x - 3y) B. 4(3x - 2y)(2x + 3y) C. 4(6x2 + 5xy - 6y2) D. 4(3x + 2y)(2x - 3y)
Solve the problem.The annual precipitation for one city is normally distributed with a mean of 267 inches and a standard deviation of 3.4 inches. In what percentage of years is precipitation in the city between 260.2 inches and 
?
A. 97.5% B. 95% C. 68% D. 99.8%
The data in the figure below represents the number of stars earned by 140 performers in a talent competition.
How many performers earned 4 stars?
A. 5 B. 10 C. 4 D. 7 E. none of these