HELP

[surreal lichen]

how do i do part a, nd b
but mainly part a
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[austere cloud]

Equate the first 2 so you get 16 = 2^n

You get n = 4

But it’s a 2n = 2^n

So you times the value of n by 2

So a8 = a1

[stuck whale]

and for part b

work out the sum of a2 + a4 +..+ a20

and a3 + a5 +..+ a19

add them up with a1

[surreal lichen]

i dont get it...

[stuck whale]

so u need to add all the terms starting from a1 to a20 yh

[surreal lichen]

why

[stuck whale]

bc thats what the question wants u to do lol

im talking about part b btw

[surreal lichen]

yh ik

idk how to do it at all

???

[stuck whale]

it wants you to add a1 a2 a3 a4.. till a20

[surreal lichen]

yes

[stuck whale]

id start off by working out a few terms

so a1 is 16

whats a2

[surreal lichen]

idk

its 2

[stuck whale]

yh

wb a3

find a4 and a5 too

see if u notice any patterns