The distributive property of multiplication over addition and the identity property of multiplication.
RS + RS = 1*RS + 1*RS (using identity property)
= (1 + 1)*RS (using distributive property)
= 2*RS
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21
it happends to be a penguins number real answer if you are doing the RS-10211 Pre-Algebra Step By Step
RT = 6 All you have to do is 15-9.
If triangle RST equals triangle MNO then RT = MO = 11 units. All the rest of the question - the lengths of RS and ST are irrelevant.
11