need some help with some series and sequence questions, would be greatly appreciated!

[talleywhacker]

1) evaulate the series 4+8+16 to s6

a.128
b.252
c.248
d.28

3) does the infinite geometric series diverge or converge? explain
1/5+1/25+1/125+1/625+...
a.it diverges, it has a sum
b.it converges, does not have a sum
c.it converges, has a sum
d.it diverges, does not have a sum

17)write the related series for the finite sequence -13,-8,-3,...,12?
a.-13+(-8)+(-3)+0+6+12=-6
b.-13+(-8)+(-3)+1+4+12=-7
c.-13+(-8)+(-3)+2+7+12=-3
d.-13+(-8)+(-3)+3+5+12=-4

18) which expression defines the given series for seven terms? -4+(-5)+(-6)+...
(don't know how to write the choices, but please help if u can)

22) find the 29th term of the following sequence 19.5,19.9,20.3,20.7,...
a.30.7
b.30.3
c.29.5
d.29.9

23) find the missing term of the following sequence. ...-45,_,-12...
a.-19.5
b.-21
c.-33
d.-28.5

Again thanks for the time and help, seriously!

 

[talleywhacker]

1) evaulate the series 4+8+16 to s6

a.128
b.252
c.248
d.28

3) does the infinite geometric series diverge or converge? explain
1/5+1/25+1/125+1/625+...
a.it diverges, it has a sum
b.it converges, does not have a sum
c.it converges, has a sum
d.it diverges, does not have a sum

17)write the related series for the finite sequence -13,-8,-3,...,12?
a.-13+(-8)+(-3)+0+6+12=-6
b.-13+(-8)+(-3)+1+4+12=-7
c.-13+(-8)+(-3)+2+7+12=-3
d.-13+(-8)+(-3)+3+5+12=-4

18) which expression defines the given series for seven terms? -4+(-5)+(-6)+...
(don't know how to write the choices, but please help if u can)

22) find the 29th term of the following sequence 19.5,19.9,20.3,20.7,...
a.30.7
b.30.3
c.29.5
d.29.9

23) find the missing term of the following sequence. ...-45,_,-12...
a.-19.5
b.-21
c.-33
d.-28.5

Again thanks for the time and help <3

 

[talleywhacker]

someone please help <3 haha. much needed... much needed.

 

[Ishuda]

Hi,

What have you tried for each problem - BTW: I believe each problem is supposed to have its own thread according to the rules for posting [but maybe not]. In any case, you might read the following:
http://www.freemathhelp.com/forum/threads/41536-Read-Before-Posting!!

Take the first problem for example

1) evaulate the series 4+8+16 to s6

a.128
b.252
c.248
d.28

What are the terms in the series to s6? Did you try to figure them out? If so, how? Where are you stuck?

 

[stapel]

1) evaulate the series 4+8+16 to s6

You figured out a pattern, listed the next three terms, added all six, and... then what?

3) does the infinite geometric series diverge or converge? explain
1/5+1/25+1/125+1/625+...

You found the common ratio, compared with the formula they gave you, and... then what?

17)write the related series for the finite sequence -13,-8,-3,...,12?

You figured out a pattern, listed the missing middle terms, added them all up, and... then what?

18) which expression defines the given series for seven terms? -4+(-5)+(-6)+...

You figured out a pattern, compared with the given expressions, and... then what?

22) find the 29th term of the following sequence 19.5,19.9,20.3,20.7,...

You figured out the pattern, created the formula for the n-th term, plugged "29" in for "n", and... then what?

23) find the missing term of the following sequence. ...-45,_,-12...

With only two terms, you can come up with just about anything that you like. So what are your thoughts? What have you tried? Where are you stuck?

Please be complete. Thank you!