11. In each of the following numbers, replace * by the smallest digit to make it divisible by 11.
(ii) 439 * 71
(iii) 86 * 72
(1) 35 * 6
(iv) 1723 * 4

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation