A patient's forearm is x-rayed for a time of 0.4s at a distance of 20in (FFD). If a new x-ray is ordered with a time exposure of 0.3s, what should the new FFD be if the current level is unchanged?
A. 17in
B. 300in
C. 32in
D. 27in
Answer: A
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For the given investment, assume that there is no opportunity for reinvestment of returns. Find the monthly return, annual return, or annual percentage return as indicated.
Find the monthly return.
A. $1161.00 B. $116.10 C. $11.61 D. $9.68
Evaluate the integral.
A. 
x3 cos 9x + 
x2 sin 9x - 
x cos 9x - 
sin 9x + C
B. 
x3 sin 9x + 
x2 cos 9x - 
x sin 9x - 
cos 9x + C
C. 
x3 sin 9x + 
x2 cos 9x - 
x sin 9x - 
cos 9x + C
D. 
x3 sin 9x - 
x2 cos 9x + 
x sin 9x + 
cos 9x + C
Matrix A is given. Find appropriate identity matrices Im and In such that ImA = A and AIn = A.A = 
A. Im = 
, In = 
B. Im = 
, In = 
C. Im =
, In = 
D. Im = 
, In = 
Find the gradient vector field of the scalar function f. (That is, find the conservative vector field F for the potential function f of F.)
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