For the given functions f and g, find the requested function and state its domain.f(x) = 
; g(x) = 
Find f ? g.
A. (f ? g)(x) = 
; {x|x ? 0}
B. (f ? g)(x) = 
; {x|x ? 3, x ? 5}
C. (f ? g)(x) = 
; {x|x ? 15}
D. (f ? g)(x) = 
; {x|3 ? x ? 5}
Answer: D
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Use an integer to express the number.One country exported $80,100,000 more than it imported, giving it a positive trade balance.
A. 80,100,000 B. -80,100,000
Solve the system of equations using substitution.
A. x = - 
, y = 2; x = 1, y = 5
B. x = 
, y = 6; x = - 
, y = -
C. x = 
, y = 
; x = - 
, y = 0
D. x = 
, y = 
; x = 1, y = 5
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the hydrogen ion concentration if the 
A. 3.98 × 10-3 B. 2.51 × 10-3 C. 2.51 × 10-2 D. 3.98 × 10-2
Find a quadratic model for the sequence with the indicated terms.
A. 
B. 
C. 
D. 
E. 