two problems

1) find the sum of integers which lie between 100 and 500 and is divisible by 7..?
2) the 3rd term of a geometric sequence is 5 and the 6th term is -40 find Asubscript12(or the 12th term i suppose..?)

i need answers plss..?

Question

two problems

1) find the sum of integers which lie between 100 and 500 and is divisible by 7..? 
2) the 3rd term of a geometric sequence is 5 and the 6th term is -40 find Asubscript12(or the 12th term i suppose..?)

i need answers plss..?

only4u · Answer

105 is the 1st term ,,, common difference is 7 .. find the value of n and get ur answer using arithematic progression

anonymous · Answer

ahh.. but how about the second one..?

only4u · Answer

last term is 497

anonymous · Answer

ahh.. tnx.. but how can i solve the second question.,?

only4u · Answer

a+2d=5 and a +5d= -40 solve to get a and d and get the 12th term

anonymous · Answer

tnx.. thank you very much..

only4u · Answer

wlcme