Find the derivative of the function.r = 
(4 - ?)
A. 
= - 
- 1
B. 
= 
+ 4
C. 
= 
+ 1
D. 
= ?2 - 1
Answer: A
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Solve the problem.A certain company has found that its expenditure rate per day (in hundreds of dollars) on a certain type of job is given by 
where x is the number of days since the start of the job. Find the expenditure if the job takes 8 days.
A. $22 B. $2200 C. $11,200 D. $112
Solve the problem.The output voltage for an AC generator is approximated by v = 156 cos 
. Find the smallest positive value of t for which the output is 144 volts. Round values to 4 decimal places.
A. 0.0038 B. 0.0086 C. 0.0028 D. 0.0076
Find all the first order partial derivatives for the following function.f(x, y, z) = ln (xy)z
A. 
= - 
; 
= - 
; 
= ln xy
B. 
= 
; 
= 
; 
= z ln (xy)z-1
C. 
= z ln 
; 
= zln
; 
= ln xy
D. 
= 
; 
= 
; 
= ln xy
Find the mode or modes for the set of numbers.$90, $57, $32, $57, $29, $90
A. $57 B. No mode C. $90, $57 D. $90