Can someone tell me the answer to. 16 = 2(2x + 4)

Can someone check if i did this correct. it’s number 4 if you’re wondering.

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

Use the given information to determine the exact trigonometric value.