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

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

rosedewittbukaterBest ResponseYou've already chosen the best response.0
I'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.
 one year ago
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