Joey made a scale drawing of an apartment. The living room, which is 8 meters wide in real life, is 4 millimeters wide in the drawing. What scale did Joey use?

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g