Completely factor the polynomial.2x4 - 6x2
A. 6x2(x - 1)
B. 2x2(x2 - 6)
C. 2x4(x2 - 3)
D. 2x2(x2 - 3)
Answer: D
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Solve the problem.When a person bends at the waist with a straight back, the force, F, exerted by the person's lower back muscles can be estimated with the formula 
where w is the person's weight, and ? is the angle made by the person's torso relative to the horizontal. Use the sum identity for sine to simplify F.
A. F = 2.89w sin ? B. F = 2.89w (sin ? + cos ?) C. F = -2.89w cos ? D. F = 2.89w cos ?
Find the partial fraction decomposition for the rational expression.
A. 1 + 
+ 
B. 1 + 
+ 
C. 
+ 
D. 
+ 
The rate at which a rumor spreads through an Alpine village of 500 residents is jointly proportional to the number of residents who have heard it and the number who have not. Initially, 15 residents heard the rumor, but 4 days later this number increased to 80. Find the number of people who will have heard the rumor after 1 wk. ? Round the answer to the nearest integer. ? __________ people
Fill in the blank(s) with the appropriate word(s).
Solve the problem.The width of a rectangle is x - 
feet and its area is 6x3 + 5x2 + 10x - 7 square feet. Write a polynomial that represents the length of the rectangle.
A. 6x2 + 8x - 14 ft B. 6x2 + 8x + 14 ft C. 6x2 + 2x + 9 ft D. 6x2 - 8x + 14 ft