c. 11
it's c because if they start with 5 then
1=5
2=6
3=7
4=8
5=9
6=10
7=11
12^2=144
144/4=36
=6
the width is 6cm
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Since you are not given any values to plug in, solving for c simple means to isolate c. First, you would subtract 32 from both sides to get F-32=9/5C. Then, you would multiply both sides by 5/9 in order to get 5/9(F-32)=C or 5/9F-160/9=C.
Hope this helps.