Grade 7 math.
can anyone me answer which property the expressions are below soon as possible?
name the property of each of these expressions:
commutative property
associative property
distributive property
x (3-y) = 3x -xy
(x + 3) + 9 = (3 + x) + 9
(4 + y) + 17 = 4 + (y +17)

answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.

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