Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
yummydum
Group Title
Using sigma notation, describe the total length of 7 pictures hung sidebyside. Then find the total length the pictures occupy along the wall if the first picture has a length of 10 inches and the length of each successive picture is 4 inches longer than the previous one.
 one year ago
 one year ago
yummydum Group Title
Using sigma notation, describe the total length of 7 pictures hung sidebyside. Then find the total length the pictures occupy along the wall if the first picture has a length of 10 inches and the length of each successive picture is 4 inches longer than the previous one.
 one year ago
 one year ago

This Question is Closed

hartnn Group TitleBest ResponseYou've already chosen the best response.0
let l1 to l7 be length of pics. from n=1 to 7, l_n and sum notation : \(\sum \limits_{n=1}^7l_n\) is your 1st part.
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.1
Hint: for the first part, denote the length of the seven pictures by a sequence \(a_1, a_2 \cdots a_7\)
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
l1 =10 and common difference d =4
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
rightI got that but for the equation..?
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
you need to find n'th tern l_n with l_1 =10 , d = 4 \(l_n = l_1+(n1)d\)
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
10, 14, 18,..\[a_n=(10)(n1)(4)\]\[a_n=104n+4\]\[a_n=144n\]\[\sum_{n=1}^{7}~14n4\]yes?
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
middle sign is + ln = 6+4n
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
oh ...i knew that..
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
now can you solve the summation ?
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
\(\sum 6+4\sum n\)
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.1
The worst pain, after the famines and diseases, is typing on an iPad. :(
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
know whats \(\sum n=..?\)
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
wow it wrote that weird.. \[\large\sum_{n=1}^{7} ~6+4n~~ \implies~~154\]
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.1
I don't know, just pointing out that a common mistake students sometimes make is that they do \(\sum 6 = 6\) when it's not.
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
i also get 154
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.1
You didn't make that mistake though, nice :)
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
err..what? i did \([6+(4\times1)]+[6+(4\times2)]+[6+(4\times3)]+\)\([6+(4\times4)]+[6+(4\times5)]+[6+(4\times6)]+[6+(4\times7)]\)
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.1
You are right.
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
10+14+18+22+26+30+34=154.....yup :)
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.1
I never said you were wrong lol, just pointing out a common mistake.
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.1
Good stuff :)
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
lol, thanks guys!
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
whats 8(n+3)??
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
10+14+18+22+26+30+34=154 ....is that not right?
 one year ago

yummydum Group TitleBest ResponseYou've already chosen the best response.2
lol no probs
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.