The crew for the spaceship ZETA must be chosen from aliens of 2 different species: Romulans and Webbans. Romulans have 2 hands and Webbans have 8 hands. If there are exactly 30 crew members,
and the crew must have a total of exactly 84 hands, then how many aliens are from Romula?

yes. we do proportions in probabilities.

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