Multiply.(4x - 10)(x + 5)
A. 4x2 + 9x - 50
B. 4x2 + 10x - 50
C. x2 + 10x + 9
D. x2 - 50x + 10
Answer: B
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Find an equation of variation in which the following are true.y varies jointly as x and w and inversely as z, and y = 
when x = 2, w = 6, and z = 60.
A. y = 4xwz
B. y = 
C. y = 
D. y = 
Find the reciprocal.
A. - 
B. - 
C. 1
D. 
Solve the problem.After introducing an inhibitor into a culture of luminescent bacteria, a scientist monitors the luminosity produced by the culture. Use a graphing utility to fit a logarithmic function to the data. Predict the luminosity after 20 hours.
A. y = 112.97 - 45.97 ln (x), -24.74 B. y = 98.75 - 32.66 ln (x), 0.91 C. y = 100.5 - 32.7 ln (x), 2.54 D. y = 107.55 - 41 ln (x), -15.27
Solve the problem.A woman walks 100 yards eastward along a straight shoreline and then swims 30 yards southward into the ocean on a line that is perpendicular to the shoreline. Using her starting point as the pole and the east direction as the polar axis, give her current position (i) in rectangular coordinates and (ii) in polar coordinates. Round the coordinates to the nearest hundredth. Express ? in degrees.
A. (i) (-100, 30); (ii) (104.40, -88.28°) B. (i) (100, -30); (ii) (11.40, -88.28°) C. (i) (100, 30); (ii) (11.40, -16.70°) D. (i) (100, -30); (ii) (104.40, -16.70°)