This math question i really dont get..
a city park contains a cylindrical artificial pond that has a radius of 7.5 m. a 2 m concrete deck will be constructed around the pond. the concrete should be at least 15 cm thick. calculate the minimum volume of concrete required to construct the deck, to one decimal place. draw a diagram.

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.

In a column proof the right column states your reasons