Factor.x7 + 4x6 - 21x5
A. x-3(x2 + 4x - 21)
B. x5(x - 3)(x + 7)
C. x5(x - 3)(x - 7)
D. x5(x + 3)(x + 7)
Answer: B
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Solve the problem.Suppose f(x) = 28.9 + 1.5 log(x + 1) models salinity of ocean water to depths of 
at a certain latitude. x is the depth in meters and f(x) is in grams of salt per kilogram of seawater. Approximate the salinity (to the nearest hundredth) when the depth is 572 meters.
A. 78.21 g/kg B. 81.21 g/kg C. -24.76 g/kg D. 33.04 g/kg
With your calculator set to radian mode and polar graphics capability, graph the following function in the window specified.r = 3?, 0 ? ? ? 2?, [-20, 20] by [-20, 20]
A. 
B. 
C. 
D. 
Find the perimeter and the area of the figure.
A. perimeter: 52 m; area: 507 sq m B. perimeter: 104 m; area: 1014 sq m C. perimeter: 104 m; area: 507 sq m D. perimeter: 507 m; area: 104 sq m
Solve the absolute value equation.|4x + 3| + 6 = 15
A. - 
, 3
B. ?
C. 2, - 4
D. 
, - 3