Please help me with this question that i got in my math class : What is 60+5-40

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

25) 56(1) = 5b a. identity property of addition b. identity property of multiplication c. commutative property of multiplication d. commutative property of addition

[tex]5 \times1 \frac{12}{13} [/tex] me