Multiply.(9 - 3i)(2 + 9i)
A. -9 - 87i
B. 45 - 75i
C. 45 + 75i
D. -27i2 + 75i + 18
Answer: C
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Find all the second order partial derivatives of the given function.f(x, y) = tan-1 (-3x + 4y)
A. fxx(x, y) = 
;
fyy(x, y) = 
;
fxy(x, y) = fyx(x, y) = 
B. fxx(x, y) = 
;
fyy(x, y) = 
;
fxy(x, y) = fyx(x, y) = 
C. fxx(x, y) = 
;
fyy(x, y) = 
;
fxy(x, y) = fyx(x, y) = 
D. fxx(x, y) = 
;
fyy(x, y) = 
;
fxy(x, y) = fyx(x, y) = 
Solve the problem.At age 50, Ann must choose between taking $20,000 at age 60 if she is alive then, or $30,000 at age 70 if she is alive then. The probability for a person aged 50 living to be 60 and 70 is .83 and 
, respectively. Using expected value, what is Ann's best option?
A. $20,000 at age 60 B. $30,000 at age 70
Multiply and simplify.
? 
A. 
B. 
C. 
D. 
y
Solve the equation.- 
y = - 
A. - 
B. 
C. 
D. - 