Which of the following are simple closed curves?
(a) A circle.
(b) A polygon.
(c) A cube.
(d) Both (a ) and (b) are correct.
(e) Both (a ) and (c) are correct.
d
Mathematics
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Write the rational expression in simplest form.
?
?
A. 
B. ?
C. ?
D. ?
E. ?
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Decide whether the statement is true or false.Two vertical angles cannot be complementary.
A. True B. False
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Perform the indicated operations, expressing the answer in simplest form with rationalized denominators.
A. 
B. 
C. 
D. 
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Find the sum of the series.
A. 
B. - 
C. - 2
D. 22
Mathematics