Help with Math PLZ (Questions in screenshot)

1.) Let's say that the circle on the graph below represents x. The arrow is pointing to all the numbers greater than x, which happens to be on -2. If it points right, this means that x can equal to any number greater than -2. So your answer is x > -2.
2.) For inequalities such as these, you can simplify just like what you do for normal equations. Let's isolate x.
[tex]x - 7 > 10[/tex]
--> [tex]x > 10 + 7[/tex]
---> [tex]x > 17[/tex]
3.) [tex]3x \leq 21[/tex]
--> [tex]\frac{3x}{3} \leq \frac{21}{3}[/tex]
---> [tex]x \leq 7[/tex]
4.) [tex]5a - 2 < 18[/tex]
--> [tex]5a < 18 + 2[/tex]
---> [tex]5a < 20[/tex]
----> [tex]\frac{5a}{5} < \frac{20}{5}[/tex]
-----> [tex]a < 4[/tex]
5.) [tex]2t + 8 \geq -4(t + 1)[/tex]
--> [tex]2t + 8 \geq -4t - 4[/tex]
---> [tex]2t + 4t \geq -8 - 4[/tex]
----> [tex]6t \geq -12[/tex]
-----> [tex]t \geq -2[/tex]