HEEELLLLPPPPP PLEASE I HAVE NO IDEA HOW TO DO THIS!!!
You are building an 8000-square-foot rectangular pen with three sides fenced along a river. The side parallel to the river faces nice homes and must be built using cedar costing $5 per foot. The other two sides can be built using chain link costing $2 per foot. What dimensions will minimize the cost of the fence?
I REALLY NEED HELP CAN SOMEONE SHOW ME STEP BY STEP :( PLEASE!