Find the measure of <2.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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

I’m really confused and need to learn this