The first term of an arithmetic sequence is 5. The third term of the sequence is 13. Which of the following expressions represents the nth term of the sequence? A 5n+ 1
B 5n+5
C 4n+1
D 4n+5

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

combine all like terms then its just a 2 step equation

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6: 4= 3/2

18: 8= 9/4

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