Which is the answer? :(

Prove that 16^4-2^13-4^5 is divisible by 11.

Which expression is equivalent to -12(3x-3/4)

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