Posted by Peter on .
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

math help 
Ms. Sue,
See my previous answer to this question.
http://www.jiskha.com/display.cgi?id=1234058590 
math help 
Frances,
can you help me solve this answer and explain it to me.
twice a number plus 7 equal 9 
math help 
Frances,
twice a number plus 7 equals 9