What's the radius of a circle with an area of 64 square feet?

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Which table shows a proportional relationship between miles traveled and gas used?