14, -8 15, one ninth 16, (0, root number three) (root number three) (-1- root number three,-1) (root number three-/kloc-
Three. 17, =2- 1+ radical number 2+ 1=2+ radical number 2.
4. 19, (1) B (1, 3) c (4,2) (2) B2 (-5,1) C2 (-2,0) (3) are symmetrical in center.
20, 10.7m 2 1, (1)y=- two thirds x+ three quarters x+2 (2)CF= seven thirds.
22.( 1) Draft (2)250 750 720 (3)700 cubic meters