To compare 7/10 and 1/2 we have to find a common denomator, this can be found by choosing a number thats both in the timestable of 2 and of 10(the denomators). For thisexample you can use 10, one of our fractions is already out to 10 so we only have to do one.
To change 1/2 into a fraction out of 10 we have to do the sme to the bottom as we do to the top. So since we are multiplying the bottom by 5 we have to mutiply he bottom by five. This gives us 5/10.
We can now compare 7/10 and 5/10 From the numerators we can clearly see that 7/10 is a greater value that 5/10 (which was originally 1/2).
The rational exponent expression of sixth root of f is <span>f to the one sixth power proof A^1/n, is called n-th root of A, for all n differ from zero</span>
Since 19 is 76% of 25, we can assume that 76% of the people in the restaurant like the new menu. 76% of 227 is roughly 173. So about 173 people liked the menu that day. Hope this helps :)