Factor by grouping.3x2 - 9xy + 5xy - 15y2
A. (3x - 5y)(x - 3y)
B. (3x + 5y)(x + 3y)
C. (3x2 + 5y)(1 - 3y)
D. (3x + 5y)(x - 3y)
Answer: D
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The life expectancy of a star is a power function of its mass. The value of the power in this function is 
. If the mass is decreased by 14%, how is the life expectancy affected? Round your answer to two decimal places if necessary.
?
A. Life expectancy is increased by 72.07% B. Life expectancy is decreased by 72.07% C. Life expectancy is decreased by 45.8%. D. Life expectancy is increased by 45.8%.
Use the summation properties to evaluate the series. The following rules may be needed: 
.
A. 112 B. 441 C. 1764 D. 462
Find an equation for the line tangent to the graph of the given function at the indicated point.f(x) = 
at (9, 5)
A. y = - 
x + 5
B. y = - 
x
C. y = - 
x + 10
D. y = - 
x + 15
The following formula may be used to estimate the weight of a horse: W (in pounds) = G²*L/330 , where G (in inches) is the horse’s girth, the circumference of the horse’s body about 4 inches behind its front legs, and L (in inches) is its length.
Estimate the weight of a 60-inch-long horse with a 71-inch girth. Round your answer to the nearest pound. A) 1833 pounds B) 703 pounds C) 775 pounds D) 917 pounds E) 594 pounds