The answer is

If we put 36x^2, then the answer we would get is

Hope this helps :)
Step-by-step explanation:

and we have 
so 

we have 
<em>Finally </em>
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<em>I really hope this helps coz it took much time </em>
Answer = 9m + 4
just do 15m subtracted from 6m to get 9m and let the 4 be
I think that £3250/month is better because why would you want to spend £4000 when you can spend £3250.