Consider the next variable declarations: int a=6, b=9;
a+sqrt(b)
The expression a+sqrt(b) has the value 9 (it adds the value of the variable a with the value of the square root of the variable b).

a+b*c
The expression a+b*c has the value 6 (because the multiplication has higher priority than the addition, it calculates the product b*c obtaining 0, then it adds the result with the value of the variable a and it equals 6).