Question

Find the 40th term of the sequence 2, -12, 72,....

Write the arithmetic sequence that has 4 means between 5 and 15

Answer 1

@timo86m

Answer 2

Find the 40th term of the sequence

What kind of sequence? arithmatic or geometric sequence?

Answer 3

arithmitic

Answer 4

http://en.wikipedia.org/wiki/Arithmetic_progression
Use the very first formula

4oth term is
2+(40-1)*((-12)-2)=-544
but i think it geo something dont seem right.

Answer 5

it actualy doesnt say..i actually assumed..but if it doesnt seem right then it is geo

Answer 6

well geo seems fishy too go with -544 :P I am so sorry if it is wrong:(

Answer 7

ok..thanks! how about #2?

Answer 8

i am sorry got no idea on second one i am googling tho :P

Answer 9

thanks!

Answer 10

http://www.regentsprep.org/Regents/math/algtrig/ATP2/ArithSeq.htm
Look at problem 9 :D

Write the arithmetic sequence that has 4 means between 5 and 15
5, , , , 15

Answer 11

15=5+(6-1)*d sfd
d=2

now insert terms using d
by adding 2 to the 5 that be 2nd term and you get 7
then add 2 to 7 to get 9 that be your 3rd and so on and so on :)

5, 7 , 9,11 ,13, 15
^ ^ ^ ^

Answer 12

thanks alot! :)