I need help with a question that has to do with Ratio and Proportion. I want to know how to do it, not just only the answer.

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265