Solve the problem.In a survey of 1000 Americans, 850 said that they own a cell phone. Assume that the survey was properly conducted and that the 1000 people surveyed represent an unbiased sample of the entire population. Estimate the standard error for this survey.
A. ? 12.75%
B. ? 11.1%
C. ? 0.1%
D. ? 1.1%
E. ? 11.3%
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 ?
Graph the function.g(x) = 
+ 5
A. 
B. 
C. 
D. 
Use a graphing calculator to solve the system of equations. Round your solutions to one decimal place.2.3x + 1.7y - 4.5z = 4.23.8x - 7.0y + 0.2z = -3.74.6x + 4.3y + 3.7z = 8.1
A. {(1.8, 2.0, -0.2)} B. {(0.9, 1.0, -0.1)} C. {(3.6, 4.0, -0.4)} D. {(0.4, 0.5, 0.0)}
Add or subtract. Assume all variables represent nonnegative real numbers.8z2
+ 2z2
A. 10z3
B. 10z2
C. -10z2
D. Cannot simplify