If 28210 and 21 & 27, which describes all the lines that must be parallel?
56
8/7
9/10
13/14
16/15
121
Only lines rands must be parallel.
Only lines tand u must be parallel.
Lines r and s and lines and u must be parallel.
Neither lines rands nor lines and u must be parallel.

c

step-by-step explanation:

at least i think its

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

it is a horizontal line.

step-by-step explanation: