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Mathematics 11 Online
OpenStudy (anonymous):

Hi need help with http://gyazo.com/4b6a6020fc5422bb0935758517f48d90 question 4

hartnn (hartnn):

u have a20= 43 = a+19 d = 5+19d so 43 =5+19d find d from here, and it will be same as 3rd.

OpenStudy (anonymous):

Can i have the raw formula?

hartnn (hartnn):

raw ?

OpenStudy (anonymous):

The formula you put the numbers into

hartnn (hartnn):

\(\huge a_n=a_1+(n-1)d \\ \huge S_n= (n/2)(2a+(n-1)d)\)

OpenStudy (anonymous):

thank you soo much <3

hartnn (hartnn):

welcome ^_^

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