Find the derivative of the function at P0 in the direction of u.f(x, y) = tan-1 
, P0(-2, 3), u = 12i - 5j
A. 
B. 
C. 
D. 
Answer: D
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Add or subtract by first simplifying each radical and then combining any like radical terms. Assume that all variables represent positive real numbers.
+ 
A. -2
B. 10
C. 10
D. 70
Insert <, >, or = between the pair of numbers to form a true statement.107.909 _____ 107.990
A. = B. > C. <
Establish the identity.
+ 
= 2 sec t
What will be an ideal response?
One of the oldest devices used for calculation is the abacus, as shown in the sample figure. Each rod names one of the positions we use in counting. Each bead on the bottom represents one unit in that column and each bead on the top represents 5 units in that column. The number illustrated in the sample figure below is 1,734.
?
Sample 
?
Choose an abacus to show 10,905.
?
A
B
?
?
C
D
?
A. C
B. B
C. D
D. A
E. none of these