Find the total amount due on a loan of $5000 for eight years and 10% simple interest

Jayda's house is located at (1, 5). she can walk in a straight line to get to cristian's house. a fast-food restaurant is located at (11, 0) and partitions the way from jayda's house to cristian's house by a ratio of 5: 1. find the coordinate of cristian's house. me . im a little stuck

What is the total surface area of this square pyramid?

Could somebody me with this radical simplification?