7/9
± 2.645751
67
10/70 = 1/7
im sorry but i THINK you cannot do that. think about it: 75/20 we do 75 first; whats half of 5? you can't do it.. whats half of 7? you cant do it, but if you do it in tenths like whats half of 70. but it will not work. now 20. whats half of 0.. nothing. whats half of 2? 1. but that wont work. So my estimate would be around; 15/8.
7/9
whats wrong with channel 7
8 9 10
7
-2
7
1326.7143
38
7 and 8
7
7 by 5
± 2.645751