First you want to isolate the variable, do this by adding 18 to both sides. You're left with 12r = 13r + 36, then subtract 13r to get the variables alone. You're then left with -1r = 36, multiply by -1 to remove the negative. The final result would be (1) r = 36.
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the seventh grader because the eighth graders got 58 which is more than 50 so the 7th grader would get the pts
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29000000000.
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SA=2lw+2lh+2hw, to find the surface area
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