Question 116987
Let x=score of fourth 


Remember, the average of the scores is simply the sum of the scores divided by the number of tests taken. So our inequality looks like this:

{{{(87+83+80+x)/4>=82}}} 




{{{87+83+80+x>=328}}} Multiply both sides by 4




{{{x+250>=328}}} Combine like terms on the left side



{{{x>=328-250}}}Subtract 250 from both sides



{{{x>=78}}} Combine like terms on the right side


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Answer:

So our answer is {{{x>=78}}} 



So he needs at least a 78 to have an average of 82 or higher