Question

ASKING FOR ANYONE'S HELP! WILL GIVE MEDAL AND I WILL FAN YOU!!!! have been stuck since 7:00 p.m.
Question 23
Given the geometric sequence where a1 = 1 and the common ratio is 6, what is the domain for n?

All integers where n ≥ 1

All integers

All integers where n ≥ −1

All integers where n ≥ 0

Question 24
Find the sum of a finite geometric sequence from n = 1 to n = 5, using the expression −3(4)n − 1.

-1,023

1,223

1,023

−4,374

Answer 1

Question 25
What is the 7th term of the geometric sequence 4, −20, 100, …?

−312,500

−12,500

62,500

1,562,500

Question 26
What is the sum of the arithmetic sequence 153, 139, 125, …, if there are 22 terms?

132

154

176

198

Question 27
What is the sum of the geometric sequence −1, 6, −36, … if there are 7 terms?

−39,991

−6,665

6,665

39,991

Question 28
Braxton loves to download new music. He originally had 41 songs but plans to purchase 4 new songs each week. He wants to know how many songs he will have after 110 weeks. Which equation should he use?

a110 = 41 + 4(110 − 1)

a110 = 41 + 4(110 + 1)

a110 = 110 + 4(41 − 1)

a110 = 110 + 4(41 + 1)

Question 29
What is the sum of the geometric sequence 3, 15, 75, … if there are 7 terms?

39,062

58,593

195,312

292,968

Question 30
Find the 12th partial sum of the summation of negative 7i plus 22, from i equals 1 to infinity.

25

40

-348

72

Question 31
Given the geometric sequence an = 3(−4)n − 1, which of the following values for n lies in the appropriate domain for n?

n = 0

n = −1

n = 1

They all lie in the domain

Question 32
The surface area of an oil spill gets 131% larger every day, represented by the function s(x) = (1.31)x − 1. On the first day, it covered an area of 21 square meters. Which function would be used to find the area of the oil spill on the 47th day?

s(x) = (1.31)21 − 1

s(x) = 21(1.31)x − 1

s(x) = (1.31)x − 21

s(x) = 1.31(21)x − 1

Answer 2

pick one

Answer 3

Question 23
Given the geometric sequence where a1 = 1 and the common ratio is 6, what is the domain for n?
all integers \(n\geq 1\) for that one

Answer 4

Thank you hun. (:

Answer 5

ready for the next one?

Answer 6

http://www.wolframalpha.com/input/?i=sum+n+%3D+1+to+5+%28-3*4^ {n-1}%29

Answer 7

Question 25
What is the 7th term of the geometric sequence 4, −20, 100,
formula must look like \(4\times (-5)^{n-1}\) so 7th term is
\[4\times (-5)^6\]

Answer 8

uhm... im not sure but i dont think something came up right for 24....

Answer 9

look at the link i sent it has the answer there
for number 25 the answer is
\[4(-5)^6=62500\]
http://www.wolframalpha.com/input/?i=4%28-5%29^5

Answer 10

#24 the answer was \(-1023\)

Answer 11

how we doing, okay?

Answer 12

yeah... (:

Answer 13

where we at #26?

Answer 14

indeed

Answer 15

can you do me a favor and repost just 26, i can't keep scrolling up so far i get lost

Answer 16

Question 26 What is the sum of the arithmetic sequence 153, 139, 125, …, if there are 22 terms?
132
154
176
198

Answer 17

ok here \(n=22\) \(a_1=153, a_n=21\times (-14)+153=-141\) we need
\[\frac{n}{2}(a_1+a_n)=\frac{22}{2}(153-141)=11\times 12=132\]

Answer 18

Question 27
What is the sum of the geometric sequence −1, 6, −36, … if there are 7 terms?

Answer 19

\[-1+6+6(-6)+6(-6)^2+6(-6)^3+6(-6)^4+6(-6)^5+6(-6)^6=-39991\]
http://www.wolframalpha.com/input/?i=-1%2B6%2B6%28-6%29%2B6%28-6%29^2%2B6%28-6%29^3%2B6%28-6%29^4%2B6%28-6%29^5

Answer 20

DO YOU KNOW HOW FREAKING AWESOME YOU ARE!?!?!

Answer 21

Question 28 Braxton loves to download new music. He originally had 41 songs but plans to purchase 4 new songs each week. He wants to know how many songs he will have after 110 weeks. Which equation should he use?

Answer 22

\[a_{110}=41+4(110-1)\]

Answer 23

lol thanks!

Answer 24

What is the sum of the geometric sequence 3, 15, 75, … if there are 7 terms

Answer 25

youre welcome, but m so serious!! If it werent for you id still be stuck on #23 no joke!!

Answer 26

\[3+3\times 5+3\times 5^2+3\times 5^3+3\times 5^4+3\times 5^5+3\times 5^6\] this is a formula for this, but with only 7 numbers you can just grind it til you find it, use a calculator

Answer 27

alright. (:

Answer 28

by calculator i mean wolfram
http://www.wolframalpha.com/input/?i=3%2B3 \times+5%2B3\times+5^2%2B3\times+5^3%2B3\times+5^4%2B3\times+5^5%2B3\times+5^6

Answer 29

looks like the answer is \(58593\) is that a choice? would you like to know the formula?

Answer 30

it is indeed a choice! (: and sure!

Answer 31

\[a\left (\frac{1-r^n}{1-r}\right)\] where \(a\) is the first term and \(r\) is the common ratio

Answer 32

ohhh mkkayy

Answer 33

so for example for \(3, 15, 75,\) the first term is \(3\) and the common ratio is \(5\)
you want the sum of the first \(7\) terms, compute
\[3\left(\frac{1-5^7}{1-5}\right)\] or \[3\left(\frac{5^7-1}{5-1}\right)\]

Answer 34

look, it is the same number!
http://www.wolframalpha.com/input/?i=3%285^7-1%29%2F4

Answer 35

where we at?

Answer 36

Question 30
Find the 12th partial sum of the summation of negative 7i plus 22, from i equals 1 to infinity
yes?

Answer 37

uhhh i think 29?
Question 29 What is the sum of the geometric sequence 3, 15, 75, … if there are 7 terms? 39,062
58,593
195,312
292,968

Answer 38

we just did that one, twice
it is \(58,593\) for that one
lets move on

Answer 39

my bad.. im so lost haha so i guess 30

Answer 40

Question 30
Find the 12th partial sum of the summation of negative 7i plus 22, from i equals 1 to infinity
this question was written by an idiot
what they want is
\[\sum_{i=1}^{12}-7i+22\]

Answer 41

there is a formula for this too, but the answer is \(-282\)
unlose yourself, you don't want to put the right answer in the wrong spot!!

Answer 42

haha yeah.

Answer 43

and thats not an answer choice....

Answer 44

unfortunately that does not seem to be an answer choice
let me check it again

Answer 45

it does say this
Find the 12th partial sum of the summation of negative 7i plus 22
right? or maybe \(-7i+22\) right?

Answer 46

check it because i am going to stick with my answer, unless there is a typo there

Answer 47

25

40

-348

72
these are answer choices....

Answer 48

or just pick the one negative number, because it is definitely negative, even though that answer is wrong

Answer 49

haha okay! (:

Answer 50

now we are at 31?

Answer 51

yes only 2 to go!! (:

Answer 52

Given the geometric sequence an = 3(−4)n − 1, which of the following values for n lies in the appropriate domain for n?
n = 0
n = −1
n = 1


this is an easy one
only \(n=1\) is in the domain

Answer 53

YOUR ARE FOREAL FOREAL AMAZINGLY WONDERFUL!!!

Answer 54

Question 32
The surface area of an oil spill gets 131% larger every day, represented by the function \( s(x) = (1.31)^{x − 1}\).

On the first day, it covered an area of 21 square meters. Which function would be used to find the area of the oil spill on the 47th day?

Answer 55

thanks (blush)

Answer 56

Haha no, Thank YOU!

Answer 57

again this question was written by an idiot, you need a number out front
want they want i think is
\[s(x)=21\times(1.31)^{x-1}\]
there are so many things wrong with this question i can't begin to explain them all, but that is the answer they are looking for
who writes this jibberish?

Answer 58

haha thank you! (:

Answer 59

you done now?

Answer 60

i just submitted lets see how we did!! (:

Answer 61

lol ok

Answer 62

probably missed the one with no right answer...

Answer 63

we missed this one....
Question 27 (Worth 1 points)

(08.04)

What is the sum of the geometric sequence −1, 6, −36, … if there are 7 terms?

−39,991

−6,665

6,665

39,991

Points earned on this question: 0

Answer 64

hmmm

Answer 65

we actually got the one that had no right answer correct... (:

Answer 66

ho ho ho
well missing one is ok i guess

Answer 67

now it is friday night, i am old and going to be
you should go out and do something more fun than math!! (for sure)
good luck

Answer 68

yes!!!! waaayyyyyyy better than my trying to answer would have been hahaha!!! thank you soo much!!!!! YOURE AMAZINGGG!!!!

Answer 69

"old and going to bed" is what i meant
you are quite welcome

Answer 70

how old are you? lol

Answer 71

older than black pepper
who was born dec 15?

Answer 72

WHAT?^^^

Answer 73

i figured "ilovehim121511" meant you loved someone born dec 15 2011 but i could be wrong, it was just a guess

Answer 74

oh lol no, thats mine and my boyfriends date. (: but no foreal.. how old are u?

Answer 75

older than you and your boyfriend put together
older than auld lang syne
so old that when i went to school they didn't teach history
....

Answer 76

gnight, ttyl

Answer 77

omg lol nooo foreall!!!!!

Answer 78

haha, well that means he doesn't wants to share his age.

Answer 79

yeah.. i think so. .-.

Answer 80

Well, they are some people who don't like sharing, Like me (;

Answer 81

yeah. dont matter to me,hah

Answer 82

but u look like u could be anywhere from 14-17 soo yeah

Answer 83

14? Nope! nor 17 (;

Answer 84

ima go with 15.

Answer 85

No. Older than 17 =P

Answer 86

mmh, im sticking with 15...

Answer 87

lol I'm not 15 hun, I don't even look like 15.

Answer 88

haha sweet heart you do (; kay byyeee now!

Answer 89

bye and thanks (;