Question 1164757
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16 = amount spent so far
c = additional amount to spend
16+c = total amount he will spend (previous + additional)


We want this total (16+c) to be 28 or smaller. So we want 16+c to be less than or equal to 28.


The inequality to solve is {{{16+c <= 28}}}. To isolate c, we undo the addition happening to it. So we'll subtract 16 from both sides


{{{16+c <= 28}}}


{{{16+c-16 <= 28-16}}}


{{{c <= 12}}}


Therefore Kevin the additional amount Kevin can spend is at most $12. He can spend $12 or he can spend less than this amount. 


Side note: your teacher may want you to restrict that c cannot be negative. So you may need to say {{{0 <= c <= 12}}}. Of course, its best to ask your teacher to clarify.
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