Simplify the polynomial by combining like terms.5x + 7 + 7x
A. 12x + 7
B. 12x - 7
C. 12x
D. 84x
Answer: A
Mathematics
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Evaluate the given rational function as indicated. If the function value is undefined, state this as your answer.If f(x) = 
, find f(2).
A. 
B. 
C. 
D. 
Mathematics
Solve using Cramer's rule.-4x + 2y - z = -14 x + 2y - 8z = -22 3x + y + z = 19
A. (4, 3, 4) B. (3, 4, 3) C. (5, 1, 4) D. (4, -3, -4)
Mathematics
Solve the problem.A lake lies between A and C, and lines AB and DE run north-south. If 
= 7.1 mi, 
= 1.1 mi, and 
= 2.5 mi, how far is it from A to C? Round to the nearest tenth.
A. 16.0 mi B. 13.6 mi C. 3.1 mi D. 16.1 mi
Mathematics
Write the augmented matrix for the system of equations.x - 4y + z = 15 y + 8z = 11 z = 14
A. 
B. 
C. 
D. 
Mathematics