Write a numerical expression for the phrase and simplify it.The sum of 5 and -6, decreased by 9
A. [5 + (-6)] - 9; -10
B. [5 - (-6)] - 9; 2
C. [5 + (-6)] + 9; 8
D. [5 + (-9)] + 6; 2
Answer: A
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Collect like terms.-11b9 + 13b4 - 6b3 + 3b9 - 3b4
A. -8b9 + 10b4 - 6b3 B. -192b C. -12b16 D. Can't be simplified
Find the length of the third side of the right triangle. Give an exact answer and, where appropriate, an approximation to three decimal places.
A. c = 
cm; c ? 12.806 cm
B. c = 
cm; c ? 6.000 cm
C. c = 
cm; c ? 11.489 cm
D. c = 18 cm
Simplify. Be sure to rationalize the denominator. Assume that all variables represent positive real numbers.
A. 
B. 5
C. 
D. 
Solve each system of equations using matrices (row operations). If the system has no solution, say that it is inconsistent.x + 3y - 2z - w = 274x + y + z + 2w = 14-3x - y - 3z - 2w = -1 x - y - 3z -2w = 11
A. {(27, 14, -1, 11)} B. {(3, 5, -5, 1)} C. {(2, 7, -9, 3)} D. {(3 + w, 5 - 2w, -5 + 2w, w)}