Decide whether the given set of numbers is a commutative group under the given operation.Natural numbers; subtraction
A. Yes
B. No
Answer: B
Mathematics
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Provide an appropriate response.Find all complex cube roots of z = -8i. Write each root in rectangular form.
A. -2i, 
+ i, 
+ i
B. 2i, - 
- i, 
- i
C. -2i, 
- i, 
- i
D. 2i, - 
+ i, - 
+ i
Mathematics
Solve the equation for x if 
.
?
?
A. 0, 
, 
B. 
, 
, 
C. 0, 
, 
D. 
, 
, 
E. 
, 
, 
Mathematics
Answer the question about the given function.Given the function f(x) = 
, list the x-intercepts, if any, of the graph of f.
A. (-
, 0)
B. (3, 0)
C. (5, 0), (-5, 0)
D. none
Mathematics
Simplify the expression.(
+ 1)(
- 1)
A. 7 - 2
B. 9
C. 7
D. 7 + 2
Mathematics