Decide whether the equation defines y as a function of x.y = 13
A. function
B. not a function
Answer: A
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Parametric equations and a parameter interval for the motion of a particle in the xy-plane are given. Identify the particle's path by finding a Cartesian equation for it. Graph the Cartesian equation. Indicate the portion of the graph traced by the particle and the direction of motion.x = 3 cos t, y = 3 sin t, ? ? t ? 2?
A. x2 + y2 = 9
Counterclockwise from (3, 0) to (3, 0), one rotation
B. x2 + y2 = 9
Clockwise from (3, 0) to (-3, 0)
C. x2 + y2 = 1
Clockwise from (1, 0) to (1, 0), one rotation
D. x2 + y2 = 9
Counterclockwise from (-3, 0) to (3, 0)
Solve the problem.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 160 seconds are required to make a 
enlargement, find the time required for a 
enlargement.
A. 504 sec B. 448 sec C. 392 sec D. 560 sec
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. Suppose that a 
person bends at an angle of 35°. Determine the force exerted by the person's back muscles, and estimate the angle that requires the back muscles to exert a force of 393 pounds.
A. 568 pounds; 35° B. 568 pounds; 55.5° C. 398 pounds; 48.3° D. 29 pounds; 55.5°
Solve the equation by completing the square.x2 + 5x - 5 = 0
A. 
B. 
C. 
D. {-5 - 3
, -5 + 3
}