Solve.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where c is cost and x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 39 watches
B. 84 watches
C. 30 watches
D. 42 watches
Answer: A
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Solve the system using Gaussian elimination.-5x - y - 5z = -68-8x + 4y + 6z = 34-7x - 9y + z = -46
A. {(4, 3, 9)} B. {(-4, 3, 8)} C. {(4, 9, 3)} D. ?
For the given position function, make a table of average velocities and make a conjecture about the instantaneous velocity at the indicated time. s(t) = t2 + 8t - 2 at t = 2
A. 
; instantaneous velocity is 17.70
B. 
; instantaneous velocity is 18.0
C. 
; instantaneous velocity is 5.40
D. 
; instantaneous velocity is ?
Write the number in standard form.The distance from the sun to Mars is 2.29 × 1011 kilometers.
A. 2,290,000,000,000 B. 229,000,000,000 C. 22,900,000,000,000 D. 22,900,000,000
Determine i) the domain of the function, ii) the range of the function, iii) the domain of the inverse, and iv) the range of the inverse.f(x) = 
A. f(x): D = 
, R = 
;
f-1(x): D = 
, R = 
B. f(x): D = 
, R = 
;
f-1(x): D is all real numbers, R = 
C. f(x): D = 
, R = 
;
f-1(x): D = 
, R = 
D. f(x): D = 
, R is all real numbers;
f-1(x): D is all real numbers, R = 