I think the answer is 3.5 m but i don't know if i'm exactly accurate....because what i did was 5x2=10 and then i did 35/10 and got 3.5... hope this helps any ^-^...
Distance on a number line is basically difference between two numbers. So we subtract the two numbers. This can be solved on a calculator btw. 7/12 - √16/81 = 5/36.