I need help with this

pull out a calculater then replace x with the number 2 (-2)+5=

Step-by-step explanation:

2 (-2)+5=

2 (-1)+5=

2 (1)+5=

2

step-by-step explanation:

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true