Sebastian was in a hotel lobby and took the elevator up 7 floors to his room. Then he took the elevator down 9 floors to the parking garage. He described his movement with the expression below. 9 + (negative 7)

What is Sebastian’s error?
Sebastian should have used –9 and 7.
Sebastian should have started at zero before adding –7.
Sebastian should have switched the two addends and written Negative 7 + 9.
Sebastian should have used 0 and –9.

the answer

b. they are parallel and will never intersect.

c

step-by-step explanation:

i think because what else can be a sample of every member

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