Answer:
Since this is a parallelogram it's congruent (the angles on one side are equal the other basically). The angles on the other side are already given and they have to be congruent to the others since it's a parallelogram. As such <TUV would be 48° and <UTV would be 54°
Using the given equation, set H to 8 meters and solve for t:
8 = 3 + 20t -5t^2
Subtract 8 from each side:
3 + 20t -5t^2 -8 = 0
Simplify:
20t - 5t^2-5 =0
Factor out -5:
-5(t^2-4t+1)=0
Divide both sides by -5:
t^2 - 4t +1 = 0
Using the quadratic formula solve for t:
t = 2 +/- √3
t = 3.73 or 0.27
The greatest common factor is 12.
as far as I can tell, is simply asking to write two more expressions, that are equivalent to the provided one, namely, grab the provided one and expand it, if you simplify the expanded version, you'd end up with the provided, for example

so let's do 6a1, 6a3 and 6a5.

