Answer
Answer (a): $\frac{1}{2}$
Answer (b): $9$
Work Step by Step
Part (a):
We substitute $x=2$ and $y=-5$ into the expression $\frac{x-y}{12+x}$.
The expression becomes $\frac{2-(-5)}{12+2}$.
Simplifying, we get $\frac{2-(-5)}{12+2}$=$\frac{2+5}{14}$=$\frac{7}{14}$=$\frac{1}{2}$
Part (b):
We substitute $x=2$ and $y=-5$ into the expression $x^{2}-y$.
The expression becomes $2^{2}-(-5)=4+5=9$.
