Answer:
12 days
Step-by-step explanation:
420/35 to find amount of days to finish book
420/35 = 12
We can display the information given as an equation:
2000 *

= 4000; r = increase per annum
Now, we rearrange and solve for r:

= 2
r =
![\sqrt[19]{2}](https://tex.z-dn.net/?f=%20%5Csqrt%5B19%5D%7B2%7D%20)
= 1.037.....
We can now work out the increase for 5 years like so:
2000 *

= 2400.205..... ⇒
$2400
76+20x
factor out 4
4 (19+5x)
so one possible dimensions of the rectangle is 4 by 19+5x
The two choices hat I think are correct are 9 or 10