Question

13-10/(4-7)^2

Answer 1

3/(-3)^2= 3/9=1/3

Answer 2

Simplifying the numerator you get 3.
To simplify the denominator you need to foil that, it may help to write it out as (4-7)(4-7). You get 16-28-28+49 .
That becomes 9 so 3/9 simplifies to 1/3.