Decide whether the relation is a function.?
A. Function
B. Not a function
Answer: A
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = (2x - 9y)3
A. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
c ? 0
B. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: lines 
c ? 0
C. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
D. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: lines 
Solve the problem.Find the derivative of the function 
at the point 
in the direction in which the function increases most rapidly.
A. 
B. 
C. 
D. 
Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 85% of the isotope left?
A. 1,500 yr B. 813 yr C. 234 yr D. 750 yr
Subtract the following complex numbers:
a. (9 + j2) - (-7 - j6) b. (6 - j6) - (8 - j2) c. (9 + j3) - (2 + j6) d. (j14) - (7 + j7)