Simplify the expression.
?
?
A. 4
B. 16
C. 24
D. 6
E. none of these
Answer: A
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Solve the problem.If you toss six fair coins, in how many ways can you obtain at least two heads?
A. 58 ways B. 64 ways C. 63 ways D. 57 ways
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = cos-1(x2 + y2)
A. Domain: all points in the x-y plane; range: all real numbers; level curves: circles with centers at (0, 0)
B. Domain: all points in the x-y plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0,0) and radii r, 0 < r ? 1
C. Domain: all points in the x-y plane; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
D. Domain: all points in the x-y plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
Solve by using the quadratic formula.x2 + 32 = 12x
A. {1, 32} B. {-32, -1} C. {8, 4} D. {-8, -4}
Use the indicated row operation to change the matrix.Replace R2 by R1 + (-1)R2.
A. 
B. 
C. 
D. 