1. the structure of the supports for the hill consists of steel beams that
run parallel and perpendicular to one another. the endpoints of the
beam shown by bc are (0, 150) and (120,0). the endpoints of the beam
shown by ad are (0, 125) and (100, 0).
a. verify and explain why the two beams are parallel.
b. if zdab = 125°, what is the measure of zcba? justify your
reasoning

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2