0.64,-3.14 I’m not really sure about the -3.14. (Sorry).
The third one because each banner costs $16 and x is the number of banners, $32 is just a one time fee so there is no x.
0.17 is bigger because you compare the values of the number in each place. There is no whole number, the tenths place is equal. Then in the hundredths place you have a 6 and a 7. 6<7 so therefore 0.17> 0.165. To help yourself out u can add a 0 at the end to then more easily compare .170 to .165
