Solve.
= 
A. {2, -6}
B. {0, -6}
C. ?
D. {0, 36}
Answer: A
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Find all the first order partial derivatives for the following function.f(x, y) = 
A. 
= - 
; 
= - 
B. 
= - 
; 
= - 
C. 
= - 
; 
= - 
D. 
= 
; 
= 
Solve the problem.A corporation's bank account has $6531 in it when the treasurer writes checks for $1765, $1708, and $582. Then, deposits of 
and $4184 are made. What is the new balance?
A. $5042 B. -$5042 C. $8602 D. $8020
Solve.An arrow is fired straight up from the ground with an initial velocity of 
per second. Its height, 
in feet at any time t is given by the function 
Find the interval of time for which the height of the arrow is greater than 
A. before 
sec or after 
sec
B. before 
sec
C. after 
sec
D. between 
and 
sec
A piece of sheet metal, 20 inches wide, is bent to form the gutter shown in the illustration. If the cross-sectional area is 50 square inches, find the depth of the gutter.
?
?
A. 6 in B. 7 in C. 8 in D. 5 in