Book Maths Puzzle Algebra

What is vertex of x^2-x-6=0?

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Book Other Question

1) x=3/x+2
2) 3-x=8/x+3
3) 3/x+1=8/x+2 - 5/x+3
It's a brilliantly sunny day. I'm 5'2" tall and my shadow is 6'.
The tree across the street's shadow is 18'. How tall is the tree?
The building across the other street is 30' tall . How tall is it's shadow?