What is the twentieth term of the arithmetic sequence 21, 18, 15, 12, ... ?

-36

Step-by-step explanation:

21, 18, 15, 12

All you have to do is subtract 3 less on each number you get, until u get to the twentieth term

21, 18, 15, 12, 9, 6, 3, 0, -3, -6, -9, -12, -15, -18, -21, -24, -27, -30, -33, -36

-36 is the twentieth term of this arithmetic sequence

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