What number is underlined??????

It's already a square; we don't need to add anything to complete the square.

That's a vertex at x = -1. The corresponding y is y=0.
Answer: Vertex at (-1,0)
As for the other questions cut off there, the axis is the vertical line x = -1 and the range is y ≥ 0.
Answer:
AT = 8
Step-by-step explanation:
Using the sine ratio in the right triangle
and sin45° = 
sin45° =
=
= 
Multiply both sides by AT
AT × sin45° = 8, that is
AT ×
= 8
Multiply both sides by 
AT = 8
Answer:
x ≤ -5
Step-by-step explanation:
4x-2 ≤-22
Add 2 to each side
4x-2+2 ≤-22+2
4x ≤ -20
Divide each side by 4
4x/4 ≤ -20/4
x ≤ -5