Solve the system by substitution. x - 4y = -13-5x - 4y = -7
A. {(-1, 3)}
B. {(-3, -1)}
C. {(0, 2)}
D. ?
Answer: A
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Use trial and error to factor the trinomial, or state that the trinomial is prime.20x2 + 23x + 6
A. (4x - 3)(5x - 2) B. prime C. (20x + 3)(x + 2) D. (4x + 3)(5x + 2)
Multiply.(10x - 3y)2
A. 10x2 + 9y2 B. 10x2 - 60xy + 9y2 C. 100x2 - 60xy + 9y2 D. 100x2 + 9y2
Simplify the exponential expression.(x-7)8
A. -7x8
B. -7x56
C. 
D. -x56
Solve the problem.The table lists the average composite scores on a national entrance exam for selected years.
(i) Make a line graph of the data.(ii) If the graph represents a piecewise-linear function f, find a symbolic representation for the piece of f located on the interval 
A. 
f(x) = 0.75x - 1359.5 if 1986 ? x ? 1990
B. 
f(x) = 131.5 if 1986 ? x ? 1988
C. 
f(x) = 4.4x - 8615.7 if 1990 ? x ? 1992
D. 
f(x) = 122.7 if 1990 ? x ? 1992