Phrases '10 plus a number' and 'a number more than 10' represent the expression 10+x, while 'A number taken away from 10' does not.
10 plus a number and a number more than 10 indicate the algebraic expression 10+x because they represent the addition of 10 and another number, which is x in this case. Therefore, these phrases match the expression 10+x.
A number taken away from 10 does not match the expression 10+x as it represents subtraction, not addition. Therefore, it does not indicate the algebraic expression 10+x.
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