I don’t know how to measure the angles

the measure of the angle is 130°

Step-by-step explanation:

50 and ? are supplementary angles

supplementary angles add up to 180

50 + ? = 180

subtract 50 from both sides of the equation

50 + ? - 50 = 180 - 50

? = 180 - 50

? = 130

kkkll

step-by-step explanation:

kljlklj

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.