Answer:
a) 83½

Step-by-step explanation:
Please see the attached pictures for full solution.
A graphing calculator finds the regression line to be
y = 5.5x + 52
You would have 14.76 trees cut
For 16 it's 8/10 for 17 it's 52/100 for 18 it's -92/100 for 19 it's -48/100 for 20 it's 86/100 for 21 it's 76/100
Answer:
6(x-3y+6)
Step-by-step explanation: