Question 1202437
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From the problem, you have this inequality

    21 + c < 36.


Subtract 21 from both sides of this inequality and get

    c < 36 - 21

    c < 15.


<U>ANSWER</U>.  The additional amount which Nicole can spend is less than $15.
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Solved and written for you as a mantra / (= TEMPLATE),

so you can repeat it every time as you solve similar problems.