What does x equal on a quadrilateral if the other angles are 129, 71, and 42

The other angle is 118 degrees

Step-by-step explanation:

All quadrilaterals add up to 360 degrees, so if we add 129+71+42 we get 242. Now we take 242 from 360 and get 118. Hope this helped :)

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it

i need more details

step-by-step explanation: