Question

please answer for a medal! Record the next three terms for each sequence. then write an explicit function for each sequence. u0=45, un=1.2un-1 where n is greater than or equal to 1

Answer 1

un and u 0 ??

Answer 2

\[\large\rm u_o = 45 ~~~~u_n =1.2_{n-1}-1\]
looks like this ?

Answer 3

yes. but the second one has a U after the 1.2

Answer 4

ohh i forgot sorry \[\large\rm u_o = 45 ~~~~u_n =1.2u_{n-1}-1\]
so is it geometric or arithmetic ??

Answer 5

I don't know, thats all the problem said

Answer 6

you can find out by looking at the \[\large\rm u_n =1.2u_{n-1}\]
do you know the formulas for geometric and arithmetic sequence ?

Answer 7

Its asking for the next three terms. please just give answers, and re-read my question

Answer 8

i know what they are asking for
tell me what is geometric sequence
what is arithmetic sequence ?
do you know the formulas
if you don't know what r or d
or if you don't know the formula for geometric or arithmetic seq you can't find 3 terms

Answer 9

http://www.mathwords.com/a/arithmetic_sequence.htm

Answer 10

nice link..!
recursive formula for geometric sequence \[\huge\rm a_n = a_{n-1} \times r \]
and recursive formula for arithmetic seq is \[\huge\rm a_n = a_{n-1} + d\]

Answer 11

awesome so whats the answer

Answer 12

Geometric sequence: the ratios of the consecutive terms are the same
; geometric when you multiply previous term to get the next term
Arithmetic sequence: when the difference between consecutive terms are the same
when you add or subtract previous term to get the next one

Answer 13

i don't have much time whats the answer

Answer 14

\[\large\rm u_n =1.2u_{n-1}\]
now after reading that info what you think is it geometric or arithmetic ??

Answer 15

arithmetic

Answer 16

how ??

Answer 17

oh wait no geometric now whats the next step

Answer 18

why is that geometric ??

Answer 19

because multi

Answer 20

please just work it out so i can see it!!!!!!!!!!

Answer 21

Geometric = ratio = multiplication
Arithmetic = difference = + sign

Answer 22

okay great can u answer the question??? this is taking forever.

Answer 23

yep that's right geometric \[\large\rm u_n =1.2u_{n-1}\]
so r = 1.2
explicit formula for geometric sequence is \[\large a_n = a_1 ( r)^{n-1}\]
r= ratio
n = term that you have to find (1 ,2 ,3)
replace variables by their values

Answer 24

is that \[\large\rm u_o ~~~or ~~ u_1 ???\]

Answer 25

0

Answer 26

so whats the answer

Answer 27

helloo????????????

Answer 28

to find first term
replace u_o by 45
r by 1.2
and n =1 and solve for u_1