Answers

2015-07-19T08:49:07+08:00
On this sequence the 1st term is 83 or A1=83. the last term is 5. An=5. The common difference is -3.
using the formula in finding An you'll have
An = A1 + (n-1) d
5 = 83 + (n-1)(-3)
5 = 83 -3n +3
transpose -3n to the left and 5 to the right
3n = 83 + 3 + 5
3n = 91
n = 91/3
recheck the given problem
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pls answer this 1,1 1/4,1 1/2,.....,9 3/4 find n
you just have to do the same since this is in arithmetic sequence. A1=1, An=9 3/4, d=1/4. just substitute them to the formula and you'll get n
thank you very much
my answer is 8.25 correct or not correct
pls answer this fill in the gaps in this arithmetic sequence:-3,_,_,_,_,_,12