If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.
Thus, A would be the correct answer choice here.
Answer:
D would be 75 degrees and C would be 40
Explanation:
triangle DoC is a flipped and rotated version of triangle BoA.
Hope this helps :)
The Antonine Plague (smallpox and measles) most likely emerged in China shortly before 166 CE spreading westward along the Silk Road and by trading ships headed for Rome. Sometime between late 165 to early 166 CE, the Roman military came into contact with the disease in western Asia and brought it back to Rome.
