Question 582723
You start out with d dollars. You spend 22 dollars. So you now have d - 22 dollars left


But since you know for certain that you have "at least 28 left", this means that the quantity d - 22 is greater than or equal to 28. So we know that 


{{{d-22>=28}}}


Now let's solve for 'd'



{{{d-22>=28}}} Start with the given inequality.



{{{d>=28+22}}} Add {{{22}}} to both sides.



{{{d>=50}}} Combine like terms on the right side.



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Answer:


So the solution is {{{d>=50}}} 



This means that you had at least $50 in the account initially.