Perform the indicated operation. Write the answer in scientific notation.(4 × 10-6)(7 × 10-9)
A. 280 × 10-15
B. 2.8 × 1054
C. 28 × 10-14
D. 2.8 × 10-14
Answer: D
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Solve.The pitch of a screw is the distance between threads. With each complete rotation of the screw, it goes in or out a distance equal to its pitch. How far will a screw with a pitch of 
in. go into a piece of wood when it is turned 10 complete rotations clockwise?
A. 
in.
B. 
in.
C. 
in.
D. 
in.
Solve the problem.In an electrical circuit, let V represent the electromagnetic force in volts at t seconds. Assume 
. Find the smallest positive value of t where 
for 
.
A. 
sec
B. 
sec
C. 
sec
D. 0 sec
The joint cost (in dollars) for two products is given by 
, where x represents the quantity of product X produced and y represents the quantity of product Y produced. Find the marginal cost with respect to x if 2 units of product X and 9 units of product Y are produced.
?
A. 
B. 
C. ?
D. ?
E. ?
Determine whether F is conservative. If so, find a function f such that F = ?f.
Select the correct answer.
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