A is the answer to your question
<h3>
Answer: 42.8 feet</h3>
Work Shown:
h = height of the building
h is opposite the reference angle (55)
the adjacent side is 30 feet
tan(angle) = opposite/adjacent
tan(55) = h/30
h = 30*tan(55)
h = 42.84444 which is approximate
h = 42.8 feet
(1)the GCF for the polynomial 
4x^3 = 2*2* x* x* x
2x^2y = 2*x*x*y
Greatest common factor is 
(2) the GCF for the polynomial 


GCF is 
(3) the GCF for the polynomial


GCF is 
(4) the GCF for the polynomial 


GCF is 
Sorry I was moving around taking the picture and my handwriting is sloppy. But I hope you understand how I got the answer
Answer: The first one is -3 and I'm not sure about the second one