Roger is 16 years old. His sister Betty is 3 years more than half of his age. Write a numerical expression to represent Betty's age.

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

This is about circle theorems. someone asap : (