Please answer these. No need to explain thoroughly

\fQuestion 15: {1 point) A quantity of radioactive uranium is decaying according to the law _l3 3,: = Aug 2 Which of the following gives the time t [in hours) for the uranium to decal:r to one third of the initial amount A0 ? 1 O E O 103 10(30) 24 2111(3) O 31I'l [2) Question 16: (1 point) The function /(x) = x- + x + 3 attains its minimum value at O none of the above O x =1 O X = 0 O X= - 2 O X= -1