Find the product.(4x - 5y)2
A. 4x2 + 25y2
B. 16x2 - 40xy + 25y2
C. 4x2 - 40xy + 25y2
D. 16x2 + 25y2
Answer: B
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Solve the problem.John, the tallest male in the sophomore class, has a height of 71.75 inches. The heights of sophomore males are normally distributed with mean 67.8 inches and standard deviation 2.5 inches. Determine the z-score corresponding to John's height.
A. z = 1.68 B. z = 1.48 C. z = 1.78 D. z = 1.58
Solve the system by the addition method.x2 + y2 = 44x2 + 16y2 = 64
A. {(0, 4), (0, -4)} B. {(4, 0), (-4, 0)} C. {(0, 2), (0, -2)} D. {(2, 0), (-2, 0)}
Find the point-slope form of the equation of the line satisfying the given conditions and use this to write the slope-intercept form of the equation.Slope = 
, passing through (0, 3)
A. y = 
x + 3
B. y = - 
x - 3
C. y = 
x + 
D. y = 
x - 3
Solve the problem.A drugstore sells two types, A and B, of humidifiers. Each humidifier of type A and type B costs $10 and $20, respectively. The store wants at least 8 humidifiers in stock and does not want its investment in the humidifiers to exceed $1000. Graph the possible inventory of the humidifiers and find the vertices. 
A. 
B. 
C. 
D. 