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DaWizjr
 2 years ago
Find S20 when t1 = 4 and d = 5
DaWizjr
 2 years ago
Find S20 when t1 = 4 and d = 5

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DaWizjr
 2 years ago
Best ResponseYou've already chosen the best response.0Now you have to use formula

Shadowys
 2 years ago
Best ResponseYou've already chosen the best response.1\(S_{n}=\frac{n}{2} (2 t_1 + (n1)d)\) sub n=20, and everything you've got there. do u need further help?

DaWizjr
 2 years ago
Best ResponseYou've already chosen the best response.0S(20=20/2(2(4)+(201)5)

DaWizjr
 2 years ago
Best ResponseYou've already chosen the best response.0And how would I work this out @Shadowys

Shadowys
 2 years ago
Best ResponseYou've already chosen the best response.1um,simplify this then. \(\frac{20}{2}[(2)(4)+(201)5]=10[8+19(5)]\) what follows can be done by manual arithmetic or a calculator.

Shadowys
 2 years ago
Best ResponseYou've already chosen the best response.1yup, that's what I got too. :)
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