(x+4)^2-(x-5)^2=9 plz solve this for me

Marcus and cody both leave the park at the same time, but in opposite directions. if cody travels 6 mph faster than marcus and after 4 hours they are 64 miles apart, how fast is each traveling? solve using rare times time = distance.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

If the perimeter of the square equals the perimeter of the regular pentagon. each side of a pentagon is 16cm long. how long is each side of the square?