Se puede determinar el valor de x² - y² si: I) x + y = 7
II) x - y = 3
A) I por sí sola
B) II por sí sola
C) Ambas juntas
D) Cada una por sí sola
E) Se requiere información adicional

the answer is 96 degrees

step-by-step explanation:

you have to realize that a line equals 180 degrees

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.