There were some people on a train 18 people get off at the first stop and 21 people get on the train there are now 65 people on the train how many people were on the train to begin with

720

step-by-step explanation:

first i did work 2nd i did work and 3rd i did work

their is no graph showing

step-by-step explanation:

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