Perform the desired operation. Write the answer in the form a + bi.(-2 + i)(-2 - i)
A. 5
B. 4
C. -3
D. -2
Answer: A
Mathematics
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Evaluate the expression x - y for the given values of the variables.x = 6.3, y = 0.85
A. 5.45 B. 5.35 C. 7.15 D. -5.45
Mathematics
Fill in the blank with one of the words or phrases listed below. Choices may be used more than once or not at all.
A set of ordered pairs that assigns to each x-value exactly one y-value is called a(n) 
.
A. domain B. function C. range D. relation
Mathematics
Find any numbers for which the rational expression is undefined.
A. x = -5 B. x = 5 C. x = 0 D. none
Mathematics
Simplify the rational expression. Find all numbers that must be excluded from the domain of the simplified rational expression.
A. 
, x ? - 
, x ? - 1
B. 
, x ? - 
C. 
, x ? - 
D. 
, x ? - 
, x ? - 1
Mathematics