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brusmack
 one year ago
Best ResponseYou've already chosen the best response.0\[\sum_{4}^{20}4x=\frac{ 4(16(16+1)) }{ 2 }=544\]

fortytwo
 one year ago
Best ResponseYou've already chosen the best response.0the answer choices are 1,218 1,276 1,300 1,334

rosedewittbukater
 one year ago
Best ResponseYou've already chosen the best response.0I'm doing this test right now. I have no idea if I'm right because I havent finished it yet, but I did 253 to get 22 because thats how many numbers are in between 4 and 25 including 4 and 25. Then I used the formula the book gave us \[S _{n}=\frac{ n }{ 2 }(a _{1}+a _{n)}\] \[S _{22}=\frac{ 22 }{ 2 }(116)\] \[=\frac{ 2552 }{ 2 }\] \[=1276\] At first I just did it in a calculator by doing (4x4)+(4x5)+(4x6)+(4x7) all the way to 4x25 and got the same thing. Then I tried the equation. Let me know if you submitted it and what you got. This unit is confusing me a lot so far.
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