URGENT PLS HELP. Pls put why or why not as well thank you:))

Yes, the given relation is a function

Since it is obvious that the cost of nails varies according to the number of pounds of nails.

The cost cannot coincide with different number of pounds.

Say if a pounds cost x and b pounds cost y, then x cannot be equal to y untill a = b.

From this conclusion, we reach our decision that since each element of set input set will have a unique image in output set, the given relation is a function.

Remember that every function is a relation but every relation is not a function.

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