Okay I get some of them, your first one - 1 I disagree with. So we can solve with two points by using a equation y2-y1 over x2-x1. So it's 4-8 over - 3-6 with the numerator being - 4 and the denominator being - 9. Any questions on how to solve for slope with two coordinates.
36; 351; 66; 1,017; 113,331; 1,968; 537; 417; 3,813
We have that the total length of paper needed to cover all the tables is

From the question we are told that:
Number of tables 
Length of table
Extension 
Generally, the equation for the Total length tables is mathematically given by


Therefore with an extension of 0.25ft at both end we have the Total length of tablecloths to be


In conclusion
The total length of paper needed to cover all the tables is

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Y=14.5
x=7
40=(34-2x)+(3x-1)
140=(3y+6)+(5y+18)