If clay cost $16.50 for 50lb how much does clay cost for 45 pounds

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.

Prove that 16^4-2^13-4^5 is divisible by 11.

Plzzz answer both questions and i will give you 100 points