Actinium is a radioactive soft metal that glows light blue in the dark. The isotope actinium-228 has a half-life of about 21.77 years. Suppose a laboratory worked with a 1.65 milligram sample of actinium-228. What function could be used to represent the amount, A, in milligrams of the actinium-228 sample after t years?

Given: hf || jk; hg ? jg prove: fhg ? kjg to prove that the triangles are congruent by asa, which statement and reason could be used as part of the proof? fgh ? kgj because vertical angles are congruent. jkg ? hfg because vertical angles are congruent. fhg ? jkg because right angles are congruent. hfg ? kjg because alternate interior angles are congruent.