Example:
4 ÷ 2 = 2 but 2 ÷ 4 = 0.5
In general a ÷ b ≠ b ÷ a, then division is not commutative
answer ...
to halp you and thank you
The scale indicates that 2.5cm/0.00001mm = 1, and due to the multiplicative identity property, you can multiply anything in an equation by one, so you would do (7cm)(0.00001mm/2.5cm) = 0.000028
3 out of 10 or 30% becasue if he is guessing and he has to get 7 out of 10 right then it would be 3 out of 10