The answer is A.All real numbers except -2.
A B and D
A & D are known as irregular polygons
Answer:
9. 
10. 
Step-by-step explanation:
9. Given the sequence
In this sequence,
Note that
then the common difference in this sequence is 
You have
then the explicit formula is
10. Given the sequence
In this sequence,
Note that
then the common difference in this sequence is 
You have
then the recursive formula is
Answer:
See explanation below.
Step-by-step explanation:
Note that in △RST and △UVW
- m∠T=180°-m∠R-m∠S;
- m∠W=180°-m∠U-m∠V.
Since ∠R≅∠U and ∠S≅∠V, then ∠T≅∠W.
In ΔRST and ΔUVW:
- ∠S≅∠V (given);
- ∠T≅∠W (proved);
- ST≅VW (given).
ASA theorem that states that if two angles and the included side of one triangle are congruent to the corresponding parts of another triangle, then the triangles are congruent.
By ASA theorem ΔRST≅ΔUVW.
