To build a large sandcastle, sam and old traffic cone and fills it with sand. the cone is 18 in. tall and has a diameter of 7 in.
to the nearest cubic inch, how much sand does sam use?

a.26 in^3

b.103^3

c.232^3

d.308^3

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