Which congruence postulate or theorem would you use to prove- PLEASE HELP MORE ON MY ACCOUNT

Can you draw an isosceles triangle with only one 80 degree angle?

What is the equation and solution for the sentence? the sum of a number and thirty-one is one hundred thirteen. write the equation as n-31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and add 31 to both sides. the answer is 144. write the equation as n-31=113 and add 31 to both sides. the answer is 144.

Write two subtraction equations that are equivalent to 5 + 12 = 17.