Does anyone know how to find the side length of this square. if so then, i will mark brainlist.

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?

If u good at math hit me up on insta or sum @basic_jaiden or @ and