Step-by-step explanation:
Let x = number of games that Alex played
The total money that he spent C is given by
If he spent $45, then we can write

Solving for x, we get

This means that Alex played 15 games.
The answer is the option 3. (the arrow aimed to the center of the polygon)
Why?. Because the particle changed the direction of its movement due to a force inclined respect the motion and aimed to the center. Take in account that the vectors net force and acceleration are parallel.
The probability is very high because you need less dimes to make a full dollar other than a nickel you need more