10. Pythagorean Theorem...4^2 + r^2 = (r + 2)^2

16 + r^2 = r^2 + 4r +4

16 = 4r + 4

12 = 4r

r = 3

12. x+5 = 9x^2 + x +1

5 = 9x^2 +1

4 = 9x^2

4/9 = x^2

x = 2/3

14. 4x + 7 = 6x + 9

7 = 2x + 9

-2 = 2x

x = -1

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