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put this solution on YOUR website!twice the sum of 15 and a number
Step 1.
twice the sum of 15 and a number
REPLACE "a number" by N
twice the sum of 15 and N
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Step 2.
twice the sum of 15 and N
Replace "the sum of 15 and N" by (15 + N)
twice (15 + N)
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Step 3.
twice (15 + N)
Replace "twice" by 2
2(15 + N)
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2(15 + N) is the answer.
Edwin
