(01.06 MC) segment LR with point P between L and R

If LR = 12 and LP = 7, find PR. Explain.

PR = 19 because 12 + 7 = 19 according to the addition property of equality.
PR = 5 because 12 − 7 = 5 according to the subtraction property of equality.
PR = 19 because LR + LP = PR according to the Segment Addition Postulate, and 12 + 7 = 19 using substitution.
PR = 5 because LP + PR = LR according to the Segment Addition Postulate, and 7 + 5 = 12 using substitution.

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