It would be $42 dollars because you first need to do 500 divided by 12 which equals 41.6666667. That being said it would make sense to round the number so that each player contributed enough. I rounded to 42 because any number 5 and above you round up. Because the number is 41.6, you round up to 42. Also, they could contribute $41.67 but most likely each player would contribute around $42. Hope this helps!
If the width is 6.5 then double that to work out the two widths which would be 13. Take that from the perimeter so you're left with 21. Half 21 to work out one length which is 10.5. Length = 10.5
If you actually do these steps (highly recommended), you see that only one of these answer choices describes your result. You have created segment CD that is the same length as segment AB: a congruent segment.
