A solid box with height 90cm, width 60cm and length 30cm needs to be painted. The paint costs £0.03 per cm2.
How much will it cost to paint the box?

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