How can you find the measurement of an missing

Darian wants to build a regulation size pool table that is 9 feet in length.he plans he ordered are 18 by 36 inches. what is the scale factor of the dilation he must use to build a regulation pool table

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.