At which van Hiele level can teachers expect students to understand the main ideas behind non-Euclidean geometries?
a. Descriptive-analytic reasoning
b. Relational-inferential reasoning
c. Formal deductive proof
d. Rigor
Ans: d
Mathematics
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A. 14,348,906 B. 14,348,884 C. 14,348,904 D. 14,348,941
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A. {-9} B. {7} C. {9} D. {-7}
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sin (2x + ?)
A. 
B. 
C. -?
D. - 
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