Answer the question.Why can't we call y = (-2)x an exponential function?
What will be an ideal response?
Because the definition of an exponential function, f(x) = ax, includes a restriction that 
This is necessary so that the function can be defined for all real numbers x. Letting a be negative 
in this case) and letting 
would yield the expression (-2)1/2, which is, of course, not real.
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Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. no solution; ? B. {(1, 8)} C. {(1, 7)} D. {(0, 8)}
Parametrize the surface S.S is the cap cut from the paraboloid z = 
- 9x2 - 9y2 by the cone z = 
What will be an ideal response?
Use multiplication to check the answer. If an answer is incorrect, find the correct answer.
A. Incorrect; should be 2367 R3 B. Correct C. Incorrect; should be 2368 R5 D. Incorrect; should be 2367 R4
Write the rational expression in lowest terms.
A. 
B. 
C. 
D. 