A farmer has 336 feet of fencing and wants to build two identical pens for his prize-winning pigs. The pens will be arranged as shown. Determine the dimensions of a pen that will maximize its area. 
a. 42' x 56'
b. 42' x 112'
c. 41' x 92'
d. 22' x 296'
e. 14' x 168'
a. 42' x 56'
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Solve the problem. Round your answer, if appropriate.The volume of a sphere is increasing at a rate of 5 cm3/sec. Find the rate of change of its surface area when its volume is 
cm3. (Do not round your answer.)
A. 
cm2/sec
B. 2 cm2/sec
C. 10? cm2/sec
D. 
cm2/sec
Use the pH scale to answer the question.What is the hydrogen ion concentration of a solution with pH 1.5?
A. 3.2 x 10-1 B. 3.2 x 10-4 C. 3.2 x 10-3 D. 3.2 x 10-2
Find the unit vector in the same direction as the given vector.v = 3i - 4j
A. u = 
i - 
j
B. u = 15i - 20j
C. u = 
i - 
j
D. u = 
i - 
j
Solve.A coil of wire rotating in a magnetic field induces a voltage given by 
where t is time in seconds. Find the smallest positive time to produce a voltage of 10
.
A. 3.33? sec B. 3 sec C. 3.33 sec D. 3? sec