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BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.1Evaluate  dw:1339003375467:dw

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.1I got an answer of 91, but the answer choices for the problem don't include that as an answer.

dpaInc
 2 years ago
Best ResponseYou've already chosen the best response.2since you only have 5 terms, might as well just add them up... 4^2 + 5^2 + 6^2 + 7^2 + 8^2 + 9^2 = 16 + 25 + 36 + 49 + 64 + 81 = ???

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.1Wait a second, though  aren't there 6 terms (4,5,6,7,8,9)? Don't you include the the k= number AND the number above sigma?

dpaInc
 2 years ago
Best ResponseYou've already chosen the best response.2you're add k^2 so starting from k=4 to k= 9, you add 4^2 + 5^2 + ... 9^2

dpaInc
 2 years ago
Best ResponseYou've already chosen the best response.2you should get 271 as the sum of those squares

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.1Here's the equation for a quadratic series, in case you'd like it: dw:1339003827921:dw

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.1Oh, I see what you're saying. Why doesn't the formula work for this problem, though?

dpaInc
 2 years ago
Best ResponseYou've already chosen the best response.2that is correct.. but you'll have to subtract k=1 to k=3...dw:1339003974534:dw

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.1Sorry, I'm a bit confused  what does that mean  "you'll have to subtract k=1 to k=3..." ?

dpaInc
 2 years ago
Best ResponseYou've already chosen the best response.2so you can use that formula.... but isn't it easier to just write down those 6 terms and add them all up?

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.1Yes, I do think it's easier, but I wanted to figure out how I could use it with the formula. I don't believe my teacher taught us to subtract the k values  that's why I'm confused.

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.1Oh, okay. Thank you very much for your explanation! You've been most helpful! =)
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