need help understanding what I did wrong

A X 17 2 pts Incorrect Question 15 A series circuit consists of a 12.0 V source of emf, a 2.00 mF capacitor, a 1000 2 resistor, and a switch. When the switch is closed, how long does it take for the current to reach one-half its maximum value? 2.00 s 1.39 s O 0.0250 s 0.693 s 1.69 s0.5 / 2 pts Incorrect Question 16 If R1 = 6.0 02, R2 = 8.0 02, R3 = 2.0 02, 81 = 4.0 V, and E2 = 14 V, what is the power supplied to the circuit by &1? R R3 O 4.0 W 16 W 8.0 W 12 W 20 W