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I looked this up:
The properties of the trapezoid are as follows:
The bases are parallel by definition.
Each lower base angle is supplementary to the upper base angle on the same side.
SO angle a + angle d = 180
angle a = 2d substitute
2d +d = 180 d= 60
a= 2d = 120 degrees This assumes your trapezoid is labeled A B
(x+6) /(sqrt(x^2-3x-4) )
Has a domain for ALL x such that the denominator does NOT equal Zero..AND we do not have a NEGATIVE sqrt
let's find what those values are
sqrt(x^2-3x-4) = sqrt(x-4)(x+1) This WILL equal zero when x = 4 or -1 <------ NOT allowed !
ALSO from - infinity to +4 is invalid as a negative sqrt will result
to NET it all out , the domain is 4< x thru + infinity