Asked by Narancia Ghirga
Write the mathematical expression that describes the arithmetic sequence.
Use sigma notation to describe the sum of the first ten terms of the arithmetic sequence
20, 18.5, 17, 15.5, 14, (the difference is from -1.5)
Help, please!
Use sigma notation to describe the sum of the first ten terms of the arithmetic sequence
20, 18.5, 17, 15.5, 14, (the difference is from -1.5)
Help, please!
Answers
Answered by
Reiny
term(n) = -1.5n +c
so when n = 1 your want term(1) to be 20
-1.5(1)n + c = 20
c = 21.5
term(n) = -1.5n + 21.5 , where n is a natural number
now just put that in the notation that you must have studied.
so when n = 1 your want term(1) to be 20
-1.5(1)n + c = 20
c = 21.5
term(n) = -1.5n + 21.5 , where n is a natural number
now just put that in the notation that you must have studied.