Simplify the following expressions. Simplified expressions must be in lowest terms, and exponents must be positive numbers.
A. 
B. 
C. 
D. none of these
Answer: A
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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 ?
Convert as indicated. If necessary, round to two decimal places.4 liters to quarts
A. 1.04 qt B. 15.16 qt C. 3.8 qt D. 4.24 qt
Assume that the two points P(1,5) and Q(-2,3) are given. What are the coordinates of the midpoint of the line segment joining P and Q?
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Differentiate implicitly to find the slope of the curve at the given point.y3 + yx2 + x2 - 3y2 = 0; (-1, 1)
A. 
B. -2
C. -1
D. - 