How is it possible for someone to put an ear to a wall and hear someone in the next room?

Sound waves change to electromagnetic waves and then back again.

Sound waves can travel though solids.

There must be some air in the wall so the sound can travel through it.

The waves travel from room to room via air.

I WILL GIVE BRAINLIEST!!

c is the correct answer hope this !

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.