Answer:
19.3795 m
Step-by-step explanation:
If sound travels at 343 m/s and it took Karen 0.113 s to hear the echo from the wall, the distance travelled by the sound is:

Note that the distance calculated above is the distance travelled from Karen to the wall and then back from the wall to Karen. Therefore, the distance between Karen and the wall is:

The wall is 19.3795 m away from Karen.
Answer:
Input - Output
2 - $290
12 - $690
24 - $1170
Step-by-step explanation:
Cost after n months:
The cost after n months is given by the following function:

After 2 months:
This is C(2). So

After 12 months:
This is C(12). So

After 24 months:
This is C(24). So

Table:
Input - Output
2 - $290
12 - $690
24 - $1170
3x-15 is 91919919198273772727272882 xxx
The answer is b, because you have to multiply them by 3
Yes, of course there'd be white