math help

1. a number increased by 21 is 28. find the number

2. a number decreased by 12 is equal to 30. find the number.

3. 8 less than a number is 15. fid the number

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  1. See my previous answer to this question.

    http://www.jiskha.com/display.cgi?id=1234058590

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  2. can you help me solve this answer and explain it to me.
    twice a number plus 7 equal 9

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  3. twice a number plus 7 equals 9

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