Write an equivalent expression using a commutative or associative law, as indicated.x + (4y + 7); associative
A. (4y + 7) + x
B. (x + 4y) + 7
C. x + (
+ 7)
D. x + (7 + 4y)
Answer: B
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: all real numbers; level curves: parabolas 
B. Domain: all points in the xy-plane excluding x = 0; range: real numbers z ? 0; level curves: parabolas 
C. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: parabolas 
D. Domain: all points in the xy-plane excluding x = 0; range: all real numbers; level curves: parabolas 
Identify the graph of the function.
Solve the equation.4x2 - 8x + 4 = 0
A. -1, 1 B. 0, 1 C. -1 D. 1
?Suppose the resident population P(in millions) of the United States can be modeled by 
, 
, where 
/> corresponds to 1800. Analytically find the minimum and maximum populations in the U.S. for 
.
?
A. ?The population is minimum at 
and maximum at 
.
B. ??The population is minimum at and maximum at 
.
C. ???The population is minimum at 
and maximum at 
.
D. ??The population is minimum at 
and maximum at 
.
E. ?The population is minimum at 
and maximum at 
.