The first one
Step-by-step explanation:
(2x+5)(x−1)
=(2x+5)(x+−1)
=(2x)(x)+(2x)(−1)+(5)(x)+(5)(−1)
=2x2−2x+5x−5
=2x^2+3x−5
The answer for this triangle is
45 degrees
That is because you see the small square at the right bottom of the triangle, that square means it's 90 degrees and the other two degrees half to be
45 degrees