1.
b) `\sqrt9 = 3 ; -\sqrt9 = -3`
c) `\sqrt16 =4; -\sqrt16= -4`
d) `\sqrt25 = 5; -\sqrt25 = -5`
e) `\sqrt36 = 5;-\sqrt36 = -6`
f) `\sqrt144= 12 ; -\sqrt144 = -12`
g) `\sqrt(0,01) = 0,1 ; \sqrt(0,01) = -0,1`
h) `\sqrt(1/9) = 1/3 ; -\sqrt(1/9) = -1/3`
l) `\sqrt7 = \sqrt7 ; -\sqrt7 = -\sqrt7`
2.
c) `\sqrtx > 3 <=> \sqrtx > \sqrt9 <=>x>9`
d) `\sqrtx < 2 <=> \sqrtx < \sqrt4 <=> 0 ≤ x < 4`
e) `\sqrtx<1 <=> 0 ≤ x<1`
f) `\sqrtx < 4 <=> \sqrtx < \sqrt16 <=> 0≤x <16`