1. 1) 1/3x>3 >9
2) 2.4-8x<=0 -8x<=-2.4 x=0.3<br>2. 1) 3x-3-6+2x>0 5x-9>0 x>1.8
2)-9x>18 x>-2
3. 1) 4x>20 =>x>5
3x>6 =>x>2
2) x>0.1
2x>-3 => x>-1.5
4. a^2-4a+13=y^2+2y-3y+9>y^2
a^2-4a+22+y^2-y>y^2
a^2-4a+22>y^2-y^2+y, a^2-4a+22>y
y^2 +(a^2-4a+22-y)>y2
--------------------