3. Sara is trying to justify a step in her paragraph proof. What is the property that she should use? AB BC, BC XY, therefore ABXY
Reflexive Property of Congruence
Equality of Congruence Property
Symmetric Property of Congruence
Transitive Property of Congruence

Step-by-step explanation:

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answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

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step-by-step explanation: