Anon-food crop is infected by pests on the 1st of a month. the pests infect the crop in such a way that the area infected doubles after each month. if the pests continue to infect the crop in this way, the non-food crop will be entirely infected after the sixth month.
after which month will one-eighth of the non-food crop be infected?

After month 3.

Step-by-step explanation:

If you know that the crop will be completely infected after 6 months and the area infected doubles each month, you can work backwards. So picture the 6th month as 100%. Then, basically divide that percentage by 2 until you reach 1/8, or .125, or 12.5. So 100% (month 6) > 50% (month 5) > 25% (month 4) > 12.5% (month 3). So 12.5% is equal to 1/8 or .125, which is what you are trying to look for.

Hope this helps!

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80