What is the reason for step 2 in this proof?

given:

angles a and b are supplementary.
the measure of angle a = 45º.

find the measure of angle b. proof:

1. angles a and b are supplementary and angle a = 45º. (reason: given)

2. measure of angle a + measure of angle b = 180º ( reason: ? ? )

3. 45º + measure of angle b = 180º (reason: substitution)

4. measure of angle b = 135º (reason: subtraction property of equality)

a) substitution property of equality
b) definition of supplementary angles
c) transitive property of equality

Angles A and B are said to be supplementary. This piece of information should be used. Supplementary angles are angles whose sum equals 180˚. This would be later used in the further steps to fin the unknown angle B.

Thus, the answer is B) Definition of Supplementary Angles

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation:

step-by-step explanation:

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