Answer:
16.) c. 2x²+7x-15
17.) c. 
18.) D
Step-by-step explanation:
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They are equal so...
15x+2 = 9x+20
15x-9x = 20-2
6x =18
x = 18/6 = 3
x = 3
Step-by-step explanation:
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n points would divide a given line into n+1 segments.
Just assume that you have a line and you added a point to that line, this point would divide your line into two segments.
If you add two points to a line, these two points would divide your line into three segments.
So the number of segments is always greater that the number of points by 1.