the 20th term of an arithematic sequence is 64 and its 21th term is 70.can the difference between two terms46?why
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They look like this, a, a+d, a+2d.. a + (n-1)d
6th and 11th are 20 and 30
The 6th term is a+5d while the 11th is a + 10d
a+10d = 30
a+5d = 20, subtract these two
5d = 10, d=2
Plug this d back in to get a+20=30, a = 10
A is the first term while d is the common difference so
the first term is 10 and the common difference is 2.
Explanation:
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