Ineed with this. 30 points to whoever answers

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?

In the next 10 month,colin wants to save $900 for his vacation.he plans to save $75 each of the first 8 months. how much must he save each of the last 2 months in order to meet his goal if he saves the same amount each month ?

Robert is replacing sod in two square shaped areas of his backyard.one side of the first area is 7.5 feet.one side of the other is 5.7 feet.the sod costs y dollars per square foot.