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am i right?
A store displays six computers on a shelf side–by–side. If the first computer is eight inches wide and each successive computer is four inches wider than the previous one, find the total width of the computers on the shelf.
Part 1: Describe the sigma notation used in answering the question above. (2 points)
Part 2: Show all your work and answer the question. (3 points)
 one year ago
 one year ago
am i right? A store displays six computers on a shelf side–by–side. If the first computer is eight inches wide and each successive computer is four inches wider than the previous one, find the total width of the computers on the shelf. Part 1: Describe the sigma notation used in answering the question above. (2 points) Part 2: Show all your work and answer the question. (3 points)
 one year ago
 one year ago

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raytiller1Best ResponseYou've already chosen the best response.1
8 ∑ 4 + 4n n=1 ∑ 4 + 4n = 4 ∑ 1 + n 4 * 8 + 4 ∑ n 32 + 4 [8 * 9 / 2] 32 + 40 72 inches
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
no, the answer is not \[\Large \sum_{n=1}^{8}4+4n\] for part 1 Part 2 depends on part 1, so that is also incorrect
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
ok can you help me then @jim_thompson5910
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
How many computers are we talking about here?
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
so you're not summing to 8 up at the top (of the sigma), you're summing to 6
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
thats the problem above says so i guess so
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
so it should be \[\Large \sum_{n = 1}^{6}4+4n\] for part 1
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
so is the first and 2nd part for part 2 right?
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
first part is, but the second is not...and you'd have to use 6 instead of 8
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
∑ 4 + 4n = 4 ∑ 1 + n 4 * 6 + 4 ∑ n 24 + 4 [6 * 7 / 2] 24 + 25 49 inches
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
4 [6 * 7 / 2] doesn't become 25
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
84? i added thats why
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
it is 108 inches
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
108 is the total final answer for part 2
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
can you help me with another problem?
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
sure, what is it
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
help me with the steps i have an answer just don't know how? geometric partial sum ∑[i=1,5,3(4)^(i1)].
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
nevermind i found it
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
You're basically summing 3(4)^(i1) from i = 1 to i = 5 So add up 3(4)^(i1) five times like so 3(4)^(i1) 3(4)^(i1) 3(4)^(i1) 3(4)^(i1) 3(4)^(i1) Then replace the first i with 1, the second i with 2, the third with 3, etc etc like this 3(4)^(11) 3(4)^(21) 3(4)^(31) 3(4)^(41) 3(4)^(51) Now evaluate
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
but i do need help with What is the 5th partial sum of ∑[i=1,∞,1+5n]
 one year ago

raytiller1Best ResponseYou've already chosen the best response.1
the answer i got for the last problem was 11,170
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
same thing, but you're now doing it with 1+5n
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
write out 1+5n five times 1+5n 1+5n 1+5n 1+5n 1+5n then replace the first n with 1, the second with 2, etc etc to get 1+5(1) 1+5(2) 1+5(3) 1+5(4) 1+5(5)
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
Evaluate each piece, then add them all up
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
yes, you are correct the answer is 70
 one year ago
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