maffs (1 Viewer)

[astroman]

find the sum of 25 terms of the series 1+1.12+1.12²+... correct to 2 dp.

what is r?

 

[seventhroot]

 

[astroman]

i feel stupid

 

[seventhroot]

delete the thread

 

[seventhroot]

I got 133.33

 

[astroman]

is it okay if i use logs to solve instead of the guess and check coz we havent learnt them but my tutor taught me in yr 9 lol

 

[seventhroot]

umm all you have to do it put it into the formula

 

[seventhroot]

 

[seventhroot]

don't delete pls; I put effort into that latex

 

[astroman]

dw i got it, i am beast at these, just had a mind blank at 1.12^2

 

[seventhroot]

nws

 

[astroman]

stuck

the common ratio of a geometric series is 4 and the sum of the first 5 terms is 3069. Find the first term.

 

[astroman]

.

 

[astroman]

nm i got it