Simplify the exponential expression. Assume that variables represent nonzero real numbers.(-2x4y-5)(5x-1y)
A. 
B. 
C. 
D. -10x3y6
Answer: A
Mathematics
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Solve the system by the substitution method. Be sure to check all proposed solutions. x - 4y = -35x - 3y = -15
A. {(3, -1)} B. {(-3, 0)} C. {(-2, -3)} D. ?
Mathematics
Evaluate the given function.f(x) = 
x + 2 + 7, f(1)
A. 10
B. 7
C. 7
D. 7
Mathematics
Fill in the blank with one of the words or phrases listed below. Some words may be used more than once. 
In a mathematical statement, 
usually means "multiplication."
A. of B. percent C. amount D. is
Mathematics
Solve the system by substitution. If the system is inconsistent and has no solution, state this. If the system is dependent, write the form of the solution for any real number x.
x + 
y = 4
x - 2y = 21
A. (-6, 8)
B. Inconsistent, ?
C. Dependent, 
D. (6, -8)
Mathematics