There are two couches against a wall. if one takes up 4/9 of the wall and the other takes up 1/5 of the wall, how much of the wall is covered by couches?

we know that

One of the couches takes up of the wall and the other takes up   of the wall

so

To find out how much of the wall is covered by couches, add the two amounts

therefore

the answer is

of the wall is covered by couches

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

step-by-step explanation:

if you was gonna solve for a, a is a   < -12