What do you think the answer is? Tell me and I will help you some more! :)
I'm not really sure, because 650 marked down by 27% would be 474.5, which is close but not exact.
Hope I helped a little bit, sorry if I'm wrong.
Plug in the 6 and -1 to get the answers
f(6)=120
f(-1)= 8
Get a common denominator first.
89/120 becomes 1157/1560
90/130 becomes 1080/1560
Subtract the two and you get 77/1560
