Is this correct or not please tell me

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Which expression is equivalent to 3^3 + 2^2?

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