Plz plz plz answer quick! will give brainiest! lots of points!

b<11 =the board is shorter than 11cm

b>11= the box contains more than 11 books

b<12 =there are fewer than 12 beetles in the  jar

b>12= the building is taller than 12ft

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

x = 3 ± √(5+y)