Simplify. Assume that all variables represent positive real numbers.- 
A. 5
B. -5
C. -5
D. -4
Answer: D
Mathematics
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Solve the equation.30b2 + 43b - 2 = -17
A. 
, 
B. 
, 
C. - 
, - 
D. - 
, - 
Mathematics
Solve.From a 20-inch by 20-inch piece of metal, squares are cut out of the four corners so that the sides can then be folded up to make a box. Let x represent the length of the sides of the squares, in inches, that are cut out. Express the volume of the box as a function of x.
A. V(x) = 2x3 - 60x2 B. V(x) = 2x3 - 60x2 + 20x C. V(x) = 4x3 - 80x2 D. V(x) = 4x3 - 80x2 + 400x
Mathematics
Find the real solutions of the equation.
- 
= 3
A. {-1, 
}
B. {1, 
}
C. {1, 
}
D. {-1, 
}
Mathematics
Find dy for the given values of x and ?x.y = 
+ 3
; x = 4, ?x = 0.5
A. .45
B. .47
C. 
D. 
Mathematics