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MAT-152 9.2b

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Sums of Arithmetic Sequences

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captain 9.2%. what's the temperature method example again the formula though there were going to start by saying this of an arithmetic are they finite arithmetic sequence the word finite mean to do that 7/2 + 5/8 + 1 + 87 + the last number inverted 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 7 + 19 looking at the information that we need haven't had that common different Cluck-U every time and we can see that the last term is 19 and the first term is one is 8710 e 19th see if I can maybe take a button for that up to the 10th term for n and again falling in a conference so 10 over to outside AC which is 1/8 of an which is 19 I think I'm stopping at 8:19 what does a simplified ratio 10 / 2 is 5 + 901 + 19 is 2905 * 20 is 100 answer another example let's say we were at to find the integers 1 to 100 and from 12 capital n 1 to 100 K 100 what I would do I would Ace of 1 mm 100 well that would actually take me 100 term to get there right now 100 100 100 100 terminal I'm finding a piece of 100 100 is my n value number to make someone value is 1 and the in value 100 100 answer 150 + 55 I when I do that I get 5050 from 1 to 10 again just like the last case at 82181 however we don't have a have an ace of end on the 8th of November how do you get formula so big and right be an outsider first-term 1 + 10 I'm actually at not necessary find the partial sum of are not given as much information what find a person finding a personal song how to find the 150th partial sun Aaron medic sequence how to say spine 1627 3849... remember that we have a formula we can use to find a 7 equal enhance the difference in order to file find any term in order to find any in order to do the formula different by looking at her sequence to go from 5 to 16 from 16 to 27 + 11 11 every time 11 we say the differences again just by looking at it I can see the first term is fine with me and I can take this and I value Mighty value is 81 - 2 different so fun - 11 Ace of an eagle difference 11 times and minor how to find a 767 going to have 11 * 150 - 6 which means that I get one. 644 / 159 remember we're not done we're going to take that information and we're going to plug it into our formula for finding the sum of 10 over 2 hours right where we begin where we end free plug-in 154n play guitar for her and it was fine when I do I get 75 / 1649 and when I multiply together I get one third of 23000 I kind of have to work backward and your knowledge of arithmetic how to find missing Before I Let You Go alright I have written this out ahead of time you can take a second pause the video and write out the question and you don't have a job I'm here to help explain to you what's going on. There are 20 21 feet 22 seats and a third row and so on and so forth how many seats are there in all 20 Road we know that in the first second and third I don't know how many but we can do. how many seats are there in the 20th because if we're going to remember right now we know we can't find that number bro unemployment coming in for an value-creating that formula we're going to need to know if we're going to leave now we're going to leave now what are differences I don't know what RC value Define dates of one picture well the first row had 2000 the 8th of one Lookout Trail from 20 to 21 21 22 and we can tell the difference the common difference Dynasty value I need to do my AC 120 - 1 what gets me 19 now I can use all of this info formula 87 equals my different times and or just n math formula no I'm going to use this formula to find how many feet are in 24 m I'm going to say number of seats 20th well well I think that's what I'm finding right now I'm going to hi 20 + 40 + 19 3939 Southeast 20th Avenue I can definitely use my thumb of an arithmetic sequence formula of an outside event what were you doing right now is for finding the sum of all 20 road to act of 20 again and is 20 something that in in the first row Acer one there were 26 well what we just found a sub 20 and there were 39 and I do some math 20 / 2 is 10 inside parentheses I have 59 10 / 9 right out of here at the end I get 590 so I can conclude that the total number of seeds 1020 Road 590 all I have to say

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MAT-152 9.2b

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