Factor by grouping.x3 + 7x2 - 3x - 21
A. (x - 7)(x2 - 3)
B. (x2 + 7)(x - 3)
C. (x + 7)(x3 - 3x)
D. (x + 7)(x2 - 3)
Answer: D
Mathematics
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Use properties of logarithms to expand the logarithmic expression as much as possible. Where possible, evaluate logarithmic expressions.log2
A. -log2 x
B. 
C. 2
D. 1 - log2 x
Mathematics
Solve the problem.It costs $43 per hour plus a flat fee of $15 for a plumber to make a house call. Find a linear function 
whose input is the number of hours that the plumber works and whose output is the corresponding cost for the house call.
A. f(x) = 15x + 43 B. f(x) = 43x C. f(x) = 15x D. f(x) = 43x + 15
Mathematics
Solve for the indicated variable.Z = A(1 + x)1/2, for x
A. x = 
2
B. x = 
2 + 1
C. x = 
2 - 1
D. x = 
2
Mathematics
Solve the equation.
= -0.25
A. 0.25 B. -0.25 C. -4, 4 D. No Solution
Mathematics